Does not work properly please correct – MailWasher Mobile Review

I am using iphone 6 but this app does not function as it should. If i want to check mail from both accounts i have ,it does not do it i have to manually go on each account. After i wash mail they go in trash but from there i cant seem to delete those trashed emails, there is no button which allow me to do so, what happen to these trashed messages? How do i delete them from trash?
Review by Riri's IPAD on MailWasher Mobile.