Restrict Author to ONLY their post

Hi.

I am working with Membership Pro 2 and a membership site. I have 4 tiers. Admin, Author, member and guest. My site is located here: http://162.144.60.226/~taggedbyanangel/ .

I want to make it so the author of a given membership post can edit only their post. I have read two WPMU closed threads:

https://wpmudev.com/blog/limit-access-to-your-wordpress-dashboard/

https://wpmudev.com/blog/how-to-limit-the-wordpres-posts-screen-to-only-show-authors-their-own-posts/

There are leads to it but nothing concrete. Now I have installed: https://wordpress.org/plugins/manageview-your-posts-only/ which works BUT if an author logs in to my site and clicks settings (Not sure why the dashboard bar doesn’t appear) and enters the dashboard they see more than Posts and Profile. They see media, comments, Visual Composer, Fusion slider, etc. I don’t want that. They aren’t admins. I only want them to be able to manage their own post(s)

How do I hide all but Posts?

Better yet can they be restricted to the front end with edit options?

IS there a WPMU plugin for this or an MU plugin for this.