There isn't a member list or sign ups or anything, but if you deside to call yourself a white ribbon writer, you are giving off the impression that you beleive in the WRS's values...
1. I'll try and help fans who need improvement by giving them honest reviews.
2. I won't ignore fans that need honest reviews. If I read something a feel it needs work, I'll say so.
3. I beleive that characters deserve respect, and writers should make an attempt to write them similar to they are in canon.
4. I support new writers. I don't insult people or make fun of them because of their status in my fandom. We were all new once.
5. I beleive in working hard to make good original characters that don't force the canon characters OOC (The majority of these are called "Mary Sues".).
6. I'll accept constructive crisisism/suggestions in a polite way and use it to help me improve on my writing.
7. I understand that reviews arn't always a sign of how good something is. Quanity isn't quality, and somebody giving constructive critisism may still be right even if the other readers just scream about how awesome the piece is.
8. While I understand new writers can be sensitive, I also understand hiding your suggestions does not help them improve their work.
Nobody is expected to be perfect, just try and help the IC challenged out and try to be IC themselves.