This TiviMate setup guide for USA users walks through install, playlist login, and first-stream checks on Firestick and Android TV.
Install TiviMate
Install TiviMate from a trusted APK source or app store where available. Open the app, allow storage if prompted, then choose Add playlist.
Add your TiviMate US login
Pick Xtream Codes or M3U URL, paste the host/username/password from your TiviMate US order, save, and wait for categories. See plans or contact if categories stay empty.
Background: IPTV.