Hello. Problems with a tilemap

Hello. Sorry if I use forum bad, because u bad know English. I have a problem. When I work in tile map and choosing a tile all is good. But when I’m trying to paint with this brush, I can’t. I tried all buttons on my mouse and pc. Sorry, if I don’t saw it, but I tried to read all manuals and tutorials. Sorry again…

Could you please share a screen capture?

Make sure you have a layer selected in the Outline panel before trying to paint.