How to change apps on face of watch?

As mentioned, you can do this from the iPhone Watch app.

On the Apple Watch you derp press the watch face.

Tap Custom

Tap the complication you wish to change.

Rotate the Digital Crown to scroll through the available complications for that position and n the watch face.

Thank you but I couldn’t figure out how to do it.

• iPhone "Watch" app -> My Faces
• You will see a row of all the Faces you have enabled for your Apple Watch
• Tap on the watch face you want to configure
• You will now see all the complication fields you can adjust
• Tap on each complication, and you can then change its setting

The nice thing about the forums is that there are lots of volunteers and the people that answer do it because they are having fun. If one volunteer does not know, someone else might.

And you would be surprised at home much the volunteers learn just from the questions, and reading another volunteer's answer.

So ask your questions. Someone will most likely respond.

Try making the change from the Watch App on your iPhone, it's much easier.