To be able to use multiple Coinmaster accounts without having to uninstall and reinstall the game every time you wish to play on a different account is simple.
First of all you need to have as many Facebook accounts as you want to have Coinmaster games. If you only have one Facebook account, then you can only have the one Coinmaster account.
Make sure you are logged into your Facebook app as the account you want to play as. Hold your finger on the Coinmaster app. There should be options to ‘sleep’, ‘uninstall’ and ‘App info’.
Click on app info.
Then click on storage
Then click on Clear data
You can now log in to Coinmaster with whichever Facebook account you are logged into.