Position a Secondary Menu below Header Block for Membership pages

Hi,

I'm creating a membership area on my site and once someone logs in I want a secondary menu to appear on all the members pages so they can navigate around the membership area. I'd like it to appear below the header block I use on each page: https://www.scotlandbookclub.com/members-area

Any help is appreciated! Ideally it would be a solid block colour with white writing, or black writing.

Thanks.