Well there are a lot of trolls in this thread spreading misinformation, but I'll try my best to help you.
First, make a Reddit account with a SFW username (Showderp is a Christian community). Then head on over to /r/showderphijinks then make a request in the new member thread to get access to Showderp.
Once you do so you should be able to get in and enjoy all the epic memes.
