How do i perform a boot up scan?

When i first instlalled avast i rememebr i perfomred a boot up scan, but i seem to have forgotten how to do that, can anyone tell me how? thanks!

Welcom to the forum

Please open the simple user interface at first.
(right click on “a” icon, then select “Start avast! Antivirus”)
Then click on the left corner to see the menu.
You can find “Schedule Boot-Time scan”.
Thanks