Package name "com.yourname.gamename" error

it says you must change package name  becuase  "com.yourname.gamename"  already exists on google play.
any hint?
Thank you

Hello Shooterangel,

Welcome to the forum.

Assuming that it is exactly "com.yourname.gamename" which is the default by Stencyl:

Settings -> Mobile -> General:  App ID: Use a personal one.
And/or : Settings -> Mobile -> Certificates (Android): Google App ID: same entry.

Best regards from
M.E.