LOL, sorry, I just re-read it and you're right, I didn't exactly explain it all that well.
Here's a little clearer explanation:
Next to every thread is this button. It only takes one click to put the thread on ignore and as soon as you hit it, the thread immediately fades out and is gone from view:
If you do that in error, or if you just want to see what threads you have on ignore, there are two ways to access them. You can click this button in the left floating sidebar, which should be viewable in desktop:
Or if that sidebar isn't appearing, you can click this one within the slide-out menu (desktop & mobile) that opens when you click the button on the top left of the main site navigational bar. Click on the "Forums" menu, and it's located in the group of icons at the bottom:
When you click that, it will open up the menu on the right showing the list of any threads you're ignoring. From there, you can just uncheck them to take them off ignore, and they'll reappear when you refresh the page.