Thread subscriptions.

I can't figure out how to do it. I'm used to being automatically subscribed and since its not done like that here, that's fine but i cant find any option to subscribe. Where is it?

I automatically get subscribed to threads I post in. It's in "Settings" -> "General Settings" -> "Default Thread Subscription Mode" (you select from different modes here). Threads you are subscribed to are shown in your control panel.

I switched to mostly just clicking on "new posts" in the upper left and select threads from there.

The option to subscribe to a thread without posting is on the upper right, under "Thread Tools".

I also don't mess with subscriptions. I just use the new posts screen since UU doesn't normally have 100 threads per day popping up.

+1 for the "What's New" tab in the upper left under the UU logo. Threads you have commented in will have a little green arrow on the envelope icon on the left hand side.
I hope this helps.