Another way is the way you referenced, when you have a message from a member, a drop-down option appears that you can View their profile. Also, you can friend and block them as well.
I have also seen this drop-down in a proposed state of a transaction. But in an In Progress transaction, I don't have the drop-down list anymore.
I am one of the members that helps within the site. I work closely with the IRs and can answer most questions. Please send me a message if there is anything I can assist with. If I don't know, I can certainly try to figure it out or direct you to a resource.