That’s definitely Samsung’s Messages app. It seems like you might be using your Samsung phone with a service provider other than Republic Wireless. If I’m right about that, please know folks are trying to help based on what works for Republic members. Republic likes to call customers members.
I believe the settings you’re looking for are as follows:
- Open Samsung’s Messages app
- Tap the three dots upper right
- Tap Settings
- Tap More settings
- Tap Multimedia messages
- Toggle Group conversation on
Again, the above presumes you’re not currently using Republic for mobile phone service. Might the friend who directed you here be a Republic member?