He's just asking how to delete a single add-on.
Well, that's not so easy, you have to find out what files the add-on you want to delete consists of (dl it again, look)
and then only delete those files, done.
Easier: Just delete blockland, install it again, and think before you install another addon.
Also, always keep a 100% clean version of your blockland installation as a copy, so you can just make a copy of that and try the things out there, without messing up your whole blockland installation.
and btw. the problem with the add-on chaos will be solved in v9.
