BuddyPress.org

I want to create a community website, so I install BuddyPress and Olympus theme and youzer plugin. After I finish the setup, I want to make it a paid membership community. I use “ultimate membership pro ” plugin. But my problem is that whenever I go to the register page and choose a subscription plan it takes me to the old BuddyPress registration page, not the ultimate membership pro one. In The BuddyPress register page, anyone can register and there’s no payment process. I need to replace it with the new one. I set all the settings correctly but nothing happens. maybe I need to edit the code. Can you help with that?