Store the filled presses in a dry place and allow at least a week to go by before opening the presses to check if the flowers are dry. You will find that the colours have faded somewhat and, unfortunately, there seems to be nothing that can be done about that. When the flowers are ready, remove them from the presses and carefully peel them off the blotting paper with tweezers. Allow ten minutes for the alcohol to evaporate before sticking the flowers onto your card. Any good glue can be used to stick the pressed arrangement onto your card.
Wood glue works quite well.
Use tweezers to hold the flower and gently stroke glue onto the underside of the flower with a fine paintbrush before placing it onto the card and pressing it down. But it is much more fun if you take a book on wild flowers with you and identify them as you pick them. If you have a scientific bent you can start your own botanical record for your area. Make up a file with the pressed plants, their identity and the date and area from which they were collected. Pressed flowers also make a plain parchment lampshade into a designer item.