[Gmail-Users] How to add other e-mail addresses in Gmail account

I was trying to add e-mail addresses in my Gmail account so that I can
select different reply-to addreses when I compose e-mails. I was trying
to follow the instruction from Gmail Help but I cannot find the places
they mentioned. Anybody know how to do it?

According to the help instruction, I go to Settings from the uper right
side of my Gmail page. I then select Mail Account Setting. Then I find
no where to go.

Thanks for any help!