I want to protect AdGuard settings with a password

There is no password-protect feature in AdGuard due to the specific traits of Android OS itself.
Most Android-based firmware allow users to fully control the apps they install on their devices, this control cannot be avoided on app level. Consequently, even protecting an app with a password will not let users circumvent system-level commands. The app can still be stopped or even permanently deleted via system settings.
Downloading AdGuard To install AdGuard, click the file indicated by the arrow Select "Open" and click "OK", then wait for the file to be downloaded. In the opened window, drag the AdGuard icon to the "Applications" folder. Thank you for choosing AdGuard! Select "Open" and click "OK", then wait for the file to be downloaded. In the opened window, click "Install". Thank you for choosing AdGuard!
Install AdGuard on your mobile device