You will need a button on the top of the hat so that you have something to loop the tassel around. Fasten the tassel as you would do to a graduation hat, by looping the tassel around the hat's button and securing it by criss crossing it around the button. You could fasten the tassel to the button by using a slipknot. To make a slipknot, hold the yarn with two hands. Create a loop by bring the yarn in your right hand under the yarn in the left hand, so the bottom of the yarn crosses. Secure the yarn at the crossing point. Reach through the loop, and grab the yarn on the left side. Pull the right hand back through with the yarn. Grab the two hanging ends and the loop, and pull them in opposite directions. Sometimes people want to put a yarn tassel on a crocheted hat (or other piece of knitted work like a shawl). Make the tassel separately, rather than crocheting it directly into the hat. You will want to attach the tassel to the hat after you finish the hat. Cut a piece of cardboard that is the width of the tassel length you want. You may need a different size of cardboard if you are working off a pattern. In such a case, follow the directions. Take yarn, and wrap it around the cardboard. The more you wrap it, the fuller the ultimate tassel will become. You could also wind the yarn around something else, like a videogame or CD jacket. Wind it around loosely. Now, take a separate piece of yarn, and use it to tie the yarn bundle together at one end. You want this piece to be at least 6 inches long because you will also need it to tie the tassel to the hat. Slide the yarn carefully off the cardboard. You want a loop at the end of the yarn. Take another piece of yarn, and tie it around the bundle of yarn below the already tied end. Knot it. You want to cut the loops off on the opposite end of the bundle that is tied, and trim the ends to make sure they are even. Now attach the tassel to the hat. You could use a crewel needle to stitch the tassel to the hat. Weave the end of the yard into the hat's stitches. Thread one end end into the needle, and stitch the tassel and hat together.
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One-sentence summary -- Secure a button to the hat. Put a tassel on a crocheted hat. Complete the yarn tassel. Cut the loops at one end of the tassel. Finished.

An easy way to find out how he feels is simply to ask other people. Of course, you should do this with caution because you don't want him to find out what you really think about him. Here are some ways to find out: There's no way to turn off a guy faster than to be the obsessive girl who tries to learn every detail of his life. Here are some things to avoid at all costs: Looking through his phone. If he leaves his phone out, do not look through it to see if he's texting other girls. If he catches you, he will see that as a big red flag. Looking through his email or Facebook messages. If he walks away from his computer for a minute, avoid the temptation to be a snoop. Following him around to see who he's hanging out with. This may put him more in the mood for a restraining order than romance. In the end, things may not move forward if you don't take the initiative. If you're pretty sure he likes you or are just feeling brave and like you have nothing to lose, then go ahead and tell him how you feel. Be lighthearted. Don't take it too seriously. Don't arrange a time and place to meet up and say, "I have something important to tell you." Just find the right moment to tell him you have a crush on him and are wondering if he feels it too. Don't make it a big deal--you don't want him to feel bad if he doesn't feel the same way. Be creative. Find a fun way to tell him how you feel. You can send him a note, a Valentine, or ask him to solve a riddle. Don't overdo it, but if you think outside the box, he may be impressed. In the end, it may just not be meant to be. If you want to continue the friendship, here are some things to keep in mind: Don't be too disappointed if he doesn't share your feelings. This will just make everyone feel bad in the end. It's better to play it off. Remind yourself what a great friend he is and how lucky you are to have him. You may have missed out on a chance at romance, but you have a great friend for life. Know when you need to take a break. If your crush has blossomed into full-blown love, it may be time to take a break from the friendship because it will hurt too much. If you stop crushing on him, you can return to hanging out, but there's nothing worse than torturing yourself by hanging out with someone who doesn't share your feelings.
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One-sentence summary --
Ask around. Don't stalk or snoop. Be brave and tell him how you feel! Don't be disappointed if he doesn't reciprocate your feelings.