
So you have these two, your game_text and a brush.
Select your brush and hit Ctrl+T and this should show up

Change it from a func_detail to a func_button and hit Apply

Go to the Flags tab and make sure that Use Activates is checked

Go to outputs, click add, and input the following:

Now text is going to be red, go back to your game_text and put "text" into it's name

Make sure you hit apply, and that should be it!
Note: It has to be a brush, if you want a prop to be a button, surround it with a brush and set its texture to tools/toolstrigger
Ingame:
