Password for Avast Password manager?

Hi

I just downloaded free Avast Secure Browser, so far so good.

I don’t quite understand how to put on a Master Password on the Avast password manager. I did download avast virus and add a password there, but it doestnt seem relevant for Secure Browser.

How do you add a password to Avast Password Manager so anyone can’t get to them if they have your computer.

If there is none, can I add Last Pass, which i had been using and liking with Chrome.

thank you very much