Acer Aspire 5 17" laptop. Two model numbers: N20c6 and A317-52-595V. No left click

I just purchased an Acer Aspire 5 17" laptop. Two model numbers: N20c6 and A317-52-595V. It's running windows 10, an i5 with 8 gigs of memory and an SSD. I am very discouraged about the machine as I do not find it easy to operate and the user manual leaves a lot to be desired. The touch pad is one large piece with no left/right keys. The instruction manual says to go to the lower right "notifications" to make changes to the key pad function. When I open the notifications there are four blocks: location, battery saver, (blue tooth) not connected, and night light. Nothing about changing the key pad. Yesterday I could not sign on to the computer because it switch to one of my email addresses and asked for a pin. Unfortunately there was no pin associated with that email address. I had a line that said "forgot your pin, create a new pin". Unfortunately this line was not an active link. I finally held the on/off button until the computer shut down and was able to restart the computer. The switch to the email address signon appears to be permanent although I would like to get back to using the basic machine signon. I will appreciate any help you can give me