Manage Mobile / Wi-Fi Hotspot Settings - HTC One M9
To configure Manage Mobile / Wi-Fi Hotspot Settings (e.g., password, allowed devices, etc.), view this info.
From a Home screen, navigate: Apps icon > Settings > Mobile Hotspot & Tethering.
If Settings is unavailable, tap the Dropdown menu (located in the upper-left) then select Alphabetical. If still unavailable, refer to Manage App Icons.