Take the OPPO R9S mobile phone as an example. The setting methods are as follows:

First, find the icon of "Settings" on the desktop of the mobile phone and click to enter. ?

2. After entering the setting interface of the mobile phone, find "Camera" in the menu bar and click Enter. ?

third, after entering, find the "photo watermark" and turn on the switch in its column, thus setting up the watermark camera.