The only thing I've come to hate on XenForo is editing posts. If I use colors and go to edit it, it is already formatted in the edit box and I can't edit the bbcode.
Can this be changed? By default or in your profile?
Also what is a content management system? Wikipeida doesn't help and I always thought it was the use of multiple domains/servers to run one website (such as hosting data on server, images on the other, etc)
You can't.
That is something which each member sets in their account preferences, although you could run a query to update it for all existing members.
They would be able to switch back though.
And oh, sort of like a Homepage? Why does it have it's own 'program' or name? What is different from it and a portal?