How to get brush settings?

i was trying to make a room and a while back a saw a video to make a cube like invisible too make a room in a cube with brush settings, i dont know how to get brush settings. can somebody help?

Hi, what you’re looking for a subtractive brush. When you click in the brush options, there is a radio button underneath that says “Additive” or “Subtractive.” Selecting subtractive will get you the type of brush you want.

In order to get into brush settings, just select a brush and look at the details panel.