If it's not there, open the StopAd program and go to general settings to activate it.
This menu lets you turn ad blocking on and off for the site you're on, manually block specific elements and edit blocking filters.
Then click the element on the page that you want to block. You can also use the slider to adjust the size of the element. Then just click Block element and watch it disappear. If you want to unblock something just click on "Open Filter Editor" to manage your rules.
Gray means off, green means on.