The app needs feedback botton

It will really better if we can write our mind about this app. Its need a feedback botton in the app. I like this app but why we can not change the link of these groups that we make in app. I kick someone out from Group and he comes with link group again. Pls do something for this Problem.

Sorena.mrt about Popcorn Buzz - Free Group Calls, v1.3.2