I'm an idiot
 

I'm in two groups but I completely forgot how to accept invites into groups. o///o

If you click the 'settings' option next to 'logout', it will take you to your user control panel. From there, you should see the group invitations you have and should be able to accept them from there.

I'm not seeing something to click to accept? This is what I see on the settings page and the page the notice takes me to:
http://i.imgur.com/RWXpgK2.png?1
http://i.imgur.com/OEbfQ69.png

sorry to tag on like this but it seems to be the right theme, how do you leave a group you are already in?

One more step, I suppose. Once you get to that screen, ml1201, click on the group name and it should take you to the group main page. On that page, there are two places to accept the invitation: right above the group picture, on the same line as 'Social Group' and right above the copyright line.

To leave a group, go to the group and the leave group option is in the same places as the join group option listed above.

It is all done from the page of the group you want to join or leave.

And this is why I'm saying I'm an idiot, I didn't even see that. >///>