MyBB Community Forums

How would I get a group legend like this

Above the Board Statistics on my forum (that pic above is from a mybb forum)

You would install the plugin that's around here somewhere.

How do I change the order of the groups on the legend

First off, this forum isn't for plugin support.

Secondly, in the Global Templates, find the template, and you'll see a variable. Remove that and put your HTML in, only way to change the order.