On iPhone and iPad
There are 2 options to add your logo to your photos.
1- The first option offers you to automatically add your logo to each editing photo.
As a Pro user, you can tap on
"My Content" tab
Go to "Preferences"
In "My brand" section, select "Add new logo"
Choose your logo in your images
Tap on "Add to my logos"
Make sure your new logo is well selected and it will appear automatically on your next edited images
2- The second option offers you to add your logo to your photo as an image.
Once you're editing your picture, simply tap
"+" to insert an object
select your logo in your library
position your logo as you want
The first option is not available yet on Android. It will be soon.
Alternatively, you still can use the second option.