Hello , I Apollo for the trouble caused! MutualTalk is a new developing app , it's still on the beta testing stage ,it does have some technical issues,
but I would say what happened with your kindle fire was a coincidence. Please try MutualTalk with an Android phone or ios phone, it should work,because
kindle fire is not common here in China ,we haven't tried to make MutualTalk compatible with kindle fire.

Thank you for your understanding!