1. Find the pictures you want to blend together. I've chosen to use these two below.
2. Open a new dokument, by pressing this symbol: , then choose a size which big enough for both pictures to fit in. This gives me a little more space to work on.
3. Copy the first picture by pressing the pan tool. Then paste this picture into the new dokument by rightclicking >> paste >> paste as a new layer. To move the picture around, use the Move Tool, which looks like this: . Put one of the pictures over the onther one, so it will look something like this:
4. Press the Eraser Tool, which looks like this , and set your settings like mine:
5. Use the Eraser to remove the part over the first picture, making it look nice.
, then choose a size which big enough for both pictures to fit in. This gives me a little more space to work on. 
. Then paste this picture into the new dokument by rightclicking >> paste >> paste as a new layer. To move the picture around, use the Move Tool, which looks like this: 
. Put one of the pictures over the onther one, so it will look something like this: 
, and set your settings like mine: 
