Believe it or not, more than 60% of men do not know how to properly use a condom. The first thing to know is that latex can be damaged right from the start if you aren't careful opening the package. Don't use scissors or a knife or anything sharp to open the package.
There is a right way and a wrong way to put the condom on. Some men have even reported that they have put the condom on wrong-side out, then turned it right side out and put it on again (serious risk of transferring pre-ejaculate to the outside of the condom--the part that touches the girl). When you take the condom out of the packet, put it so that it rolls down easily with the lubricant on the outside.
Leave a space at the end of the condom to act as a reservoir to catch the semen when it comes out. You don't want it squishing all over the place. Roll the condom all the way down to the base of your penis. Do this at the very beginning of sex. When you are finished, put your fingers around the base of the condom before you pull out to make sure the condom comes with you when you pull out. Voila! That's how to properly use a condom to protect yourself and your partner.
Ummm....This is kinda awkward. Put it at the tip of ur "you know what" and then roll it down your "you know what" towards your body. Make sure it fits because if it's too tight it could break and if it's too loose then it could slip right off. Make sure you leave a little bit of space at the tip for eh hemm "the stuff that comes out of your you know what" because if you don't then it could end up making a break in the condom. If you have difficulty with it, then don't be afraid to ask the girl if she can help you figure it out. If you're nervous then it'll probably be harder for you to do it, so having someone who isn't stressed about it should help.