I am using paper for 1.14.4 to host my server. I have several plugins on my server, but the one we will be focusing on is BetterRTP. I have researched all the permissions for BetterRTP, and have added the correct ones to allow players to type /rtp. However, when I add them to the group [Member] that I have created for them, players say they cannot use /rtp. I checked per user permissions, and on each of the users, they have no permissions, despite the fact that I just added them to the [Member] group. Please help!

Group permissions will not be shown when viewing player permissions. If a player has a specific group, they will simply have the permission group.<name>. Does the player you're testing BetterRTP have a permission similar to that when you checked?

Also, what permissions did you set and how did you set them?
How did you assign groups?