How to diable Avast Free edition temporary on Mac OSX 10.8.5

I am reading old posts and see:

Open Avast, go to ‘Real Time Shields’, select the modules one by one & choose STOP
You will get an option as to the length of time

Here is the problem:

I only find “Shields” and not Real time Shields.
I can select but there is nothing where I can choose Stop?

Any help highly appreciated
Aloha