Ok, it's forcing me to choose a plugin from the list above but "in post ads" doesn't show up (even though its installed on my site).
So, I chose the WPMU dev dashboard plugin because it made me. BUT, that plugin doesn't work properly either - I can't download any plugins directly from my site. I have to go to WPMUdev's site and upload it to WP.
Onto the In Post Ads plugin issue....
I don't know how the in post ads plugin works and I can't find any documentation other than this page: https://premium.wpmudev.org/project/in-post-ads/
I need something a little more in-depth to learn how to use that plugin.