If you're using a timr Enterprise Server you have to configure your server so that the App is able to connect to this server instead of the timr server.
Go to "More" and open the timr "Settings".
2. Your Account Settings
Insert all your Account Data and then press on the button "Enterprise Settings".
3. Configure the Enterprise Settings
Marker 1: Insert here the Hostserver. The default timr Server is timr.com
Marker 2: Deactivate "Secure Connection" in order to use an http host.
Marker 3: By pressing "Save" all changes are saved.