If the watermark you need to add is a text watermark.
Step 1: Upload your photo in Fotor’s Photo Editor through those uploading photo ways. 
Step 2: Under the "Text" menu, click “Add Text”,then enter the text you need as a watermark. 
If the watermark you need to add is an image watermark.
Step 1: Upload your photo in Fotor’s Photo Editor through those uploading photo ways.
Step 2: Upload your watermark image to uploads.
Step 2: Drag the watermark image from your uploads to overlay,then adjust the position and size you need.
Step 7: After the edit is complete, click the "Download" button in the upper right corner to save your image to your computer.
