You cant add watermark using PS express. Currently Express do not support adding text on the photos. The team will consider this for future releases.
thanks full throttle. I will delete the program until such time as its implemented. Not adding a trademark watermark is a non started for me in this day and age.
Amazing. Adobe is supposed to be the leader in digital image workflow, but can't provide the means for us to watermark our images with their mobile apps. How quaint.
Unfortunately gone from the Photoshop Mobile offerings (it was previously offered in Adobe Photoshop Touch in 2014).
Definitely an item for the "bring back" feature request list.