BuddyPress.org

Would there be a way to make plugin settings show up somewhere on member pages?

Yes, you can create a WP plugin with a settings page, then place that plugin in /wp-content/mu-plugins/ so it shows up on all WPMU blogs in the admin area.

EDIT: after re-reading this, you probably meant as a BuddyPress member settings page right? If so, don’t read the rest of this post!

Read up on how to create a settings page or use a WP plugin framework such as the one created by scribu:

https://wordpress.org/extend/plugins/scb-framework/

For how to use options in the front end, you would use the get_option() function:

https://codex.wordpress.org/Function_Reference/get_option

That should get you started.