To add your friend in PUBG MOBILE:
1) Open your Player Profile by tapping on your name from the home screen. Then select Friend List.
2) Select Invite Friend to input the email addresses of players you wish to invite (maximum of 50). Charges may apply if sending an invitation to non-ANZ players who have not downloaded or registered for PUBG MOBILE.
3) Your invitations will be sent immediately. Players you have invited will need to register for PUBG MOBILE and agree to the PUBG MOBILE Terms of Service to play with you.
4) Once your friends have registered for PUBG MOBILE, they can find you by tapping on My Friends from the home screen and selecting Find Friends. You will also receive an invitation email if your friend accepts the invitation.
Then, just select the server where your friend is located so that you can join them there! Remember: Only invited friends can join a Duo Mode game with you! If you want other players to join, simply change your mode selection in the top right corner of the screen.