Hello PicCollage Community,
If you have a PNG file for your watermark/logo, head to Freestyle in the PicCollage app and add the PNG file as a photo. Alternatively, you can upload a JPEG and use our Cutout tool to remove any unneeded white space around the watermark/logo.
If there are any additional features or tools you want added to PicCollage, please don't hesitate to let us know.