You can change nicknames by adding a comment, but it's not a good idea. 
 
If you're going to change nicknames, you need to be a bit more technical and have a good understanding of the topic. 
 
I've been doing this for a while, and I'm not sure if I can do it in the long run. 
 
I'll try to find a way to get rid of nicknames that are not part of the meta-thread, but I'm not sure how to do it.