To put a different background on your table, you must:

1. Open your profile in VIP Okey. 

2. Select the button as shown on the picture bellow.
   
3. Select the button on which two sheets are drawn one after the other and you will see the different backgrounds to choose from. You can acquire each of them against the corresponding number of diamonds / chips that is written under each background.
   
Once you like and buy a table background, you'll see "Owned" or "Rented" above it, which means it's already yours and you can use it in the game. To do this, you must press the "Use" button under the background you you want and in each game you enter, it will be displayed. If you have not selected any scaffolds, your table will look in the way that is generally set for all users.
   

Keep in mind that the table background is only visible to you in the game. If you want everyone to see the background of the table, you have to create a game in the "Play with friends" room and set as an option for the game the background you want.