RaiseUp: Not to get personal or anything, but these guys are right. So please permit me to state the painfully obvious: If you wanted to post an intelligent question regarding the nature and setup of WEP on your router, it would have been a lot more helpful had you posted more information. For example, what type of router you have, whether or not you are capable of understanding the owner's manual, what that manual stated regarding WEP and how to activate it, and precisely what you were unable to comprehend.
Posting a thread like this without doing so wastes everyone's time.