Sorry admin! won't be repeated...
the thing is that I didn't know there was a place called Proxy List!
But meh, it didn't work anyways.
I'm not sure how Ultrasurf works. I thought it just finds a proxy, and changes IE proxy settings to connect to it. But I took one of those proxies in the proxy list and changed the settings myself, but IE didn't connect successfully. Ran Ultrasurf and it worked!
I wonder what I'm doing wrong...
do those proxies expire after a while? Because where I was testing I didn't have access to the proxy list page so I tested the ones I'd recorded yesterday...