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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I'm rather new to the site as well, so I can relate and you're absolutly right about the limits in general.
If you click on your kyu you can see Discourse->Conversations to find your comments again and there is an Edit button next to your comment.
Have fun on this site
I don't know if he has changed it but it clearly states at this point in time that there are "Two teams of 5 members"