Got the paid version - love it - but how do I stop it nagging me to join the Game Center on Startup?

Hi guys
Your game is super, I have it on my iPad ($version) & MacBook (Free version)

On the iPad it keeps irritating me to sign in to the Game Center. How can I stop this?

I only want to play in single player mode on my own - no time for on-line playing ( been there, done that)

So I dont like it asking me to join the Game Center on each launch, the confirming my choice - so please tell me how to tell it stop this!!

Thanks

Mike

SenseiMK about Backgammon Masters, v1.4.6