Board Thread:Questions and Answers/@comment-26836934-20150817033430/@comment-26351712-20150817094907

To change your username, go to "Options", then "Support". Your display name is located there and you can change it.

To play the same game across platforms, you have use the same login method - i.e. I login using facebook and I can access my islands on my Nook, my Samsung (android), iPhone and iPad.