The program on your computer is the one which keeps asking for stuff. Give me my email, send this email to my friend, etc. etc. etc. There are a lot of them. Whichever program you are using, you will need it installed on you computer. If you are reading this you probably already have one.
Most people do.
If you do not have an email program ask your friends. They are the ones who will laugh at you when things go wrong, so you may as well take their recommendations so that when the time comes they will be feeling too guilty for suggesting an lame program to laugh. Or, maybe you can find a more scientific means to decide on an email program. Whichever program you have, some things you need to know before you can configure your email program are listed below. If you don't know it then you need to gather it from your Internet Service Provider.