Playing Around with Wikis

Unfortunately, I didn't have a good experience palying with Wikis. Almost every Wiki I tried, I was blocked form editing and changing them. They all required a login name and password. Right now I don't even remember how many accounts I have since I started with Library Learning 2.0 I just don't want to have another one unles it is necessary. My colleague showed me one that didn't ask for login, and I tried it. It works. It is very time consuming!