Board Thread:Love Live! School Idol Festival Lounge/@comment-28400440-20160507092353

I saved the transfer code for a previous JP sif account but it says that it's incorrect, luckily it's linked to one of my google accounts. However, this new account is really nice too and I got some URs from the promo. I want the promo on my main JP sif too so how do I change accounts using google T - T. Oh and how do I link the current account to a google account? 