Step 1: Click on the Map Selection Menu
Once you are in the game home page, simply click on map area.
Step 2: Click on the Room Icon
Once you are in the game home page, you will see a tiny house icon present left hand side under the mode selection menu. Simply click on that tiny house icon.
Step 3: Enter Room ID
Now after you clicked on that tiny house icon, something like this will appear on your screen. There will be a text area on the top left corner of the screen where you will see “Enter Room ID” will be written and an Enter button will be present next to it. Now you simply have to put the Room ID provided by the room creator (your friend, The Golden Pan) or any tournament organizer
Step 4: Enter Room Password
After you enter the Room ID in step 2, a pop up box like this will appear in which you will have to enter the unique Room Password. The organizer or the creator of the custom room in PUBG Mobile will also provide you the Room Password along with room ID. So you need to remember that or else, without the room password you will not be able to join the room. A room password can be anything from as simple as 123456 or as complex as @#$%^&7.
Step 5: Join the Slot Allotted by the Organizer
After correctly entering the Room ID and Password, you will see something like the screenshot above. In a custom room there is a space for 100 Players or 25 Squads. If it is a tournament then you will be allotted some slot. The slot can also be called as the team position, like Slot 1 = Team 1, Slot 2 = Team 2 and so on. If you are allotted the Slot 3 then you will have to double tap on the empty space under the Team 3 heading