There is no official what's app group for M3s.
If you have any queries post it in FAQ section or in Devices section or in countries sub section.

If you have any suggestions post it in the suggestions section.http://forum.flymeos.com/forum-4-1.html

If you have encountered any bugs in your firmware please file a bug report in bugs section.
http://forum.flymeos.com/forum-5-1.html