Let me refraze that ..

AdBlocker Plus was a lot easier to use in their settings. But uBlock works better.

When you are on a site and want to block something with uBlock
You click the uBlock emblem that I hope you see on the top right of your screen.

Then you click the little eye dropper.
That will give you a orange high lite box that you move onto whatever you are trying to block.
Then you click the word CREATE to block it. (capish)