Hello, I'm going to show you how to start edit mode. At the top right we have the blue figure. If you click on it, you'll see the following.

And then you can simply click on start editing. Once you've done that, there are two options. You can edit an existing tile. Like here, for example, the tile yes: you have three dots at the top right of the tile.

If you click on that, you'll get to the screen where you can adjust everything about this tile. The other option is that you add a new tile. You see the button new tile below. Then you can start creating the tile.

It's self-explanatory. If you want to leave edit mode again, you can do it the same way we entered it: by clicking at the top right. But you can also click on the blue icon below to close.