Rubberstamping

The Rubberstamp tool is in the Bitmap section. You can use this tool to paint over an area in your photo, using another part of the photo as the Source. 

• Play with the settings in Properties such as the brush size, edge. Undo and try again until you've found the right settings for the photo you're working with.
• If you check the box for "Use entire document", you can add a new Bitmap layer and paint into that, so if you mess up, you haven't wrecked your original picture.
• If you 're trying to blend 2 things together, you can lower the opacity %.
• To start you click to select the source, then brush over what you want to change.