How do I change my ringtone on my Samsung Galaxy s8?

1. From a Home screen, swipe up or down from the center of the display to access the apps screen.
2. Tap Messages .
3. If prompted to change the default SMS app, tap YES to confirm.
4. From the Inbox, tap the message containing the ringtone.
5. Touch and hold the attachment box.
6. Tap Save attachment.

And to do that;

1. Head over to the Settings Menu.
2. Search for Sound and Vibration.
3. Under the Phone Ringtone Menu, search for Phone Ringtone.
4. Now click on the SIM Name, and select the new Audio File.
5. Your new ringtone is now set.

1. From a Home screen, swipe up from the center of the display to access the apps screen. These instructions only apply to Standard mode and the default Home screen layout.
2. Navigate: Settings > Sounds and vibration .
3. Do any of the following: To set a ringtone: Tap Ringtone. Select a ringtone then tap the Back icon.

1. Check your volume.
2. Ensure Airplane Mode [Google.com] is off.
3. Turn off Do Not Disturb [Google.com].
4. Disable Call Forwarding.
5. Check Headphones or Bluetooth Connections.
6. Reboot!
7. Contact your manufacturer to see if there's a bigger problem.

1. Swipe down on your screen to access your Quick Settings and tap on.
2. Tap on Sounds and Vibration.
3. Select Volume.
4. Drag your finger across the Ringtone bar to the right increase the volume.