I played freerolls at all bigger sites, maybe you should play one of those at each new site before you begin playing ring at a new site, it really kinda distracts you when you dont know where everything is, UI wise.

At UB, when raising/betting, right beside the amount slider where usually 'bet this amount' would be, they have 'bet the pot'.
I ended up misclicking on 'bet the pot' a few times when I actually wanted to bet the amount I set with the slider.