This is the screenshot of the permition from PoorSouls
step 2 of 7
HOW TO MAKE YOUR OWN BRUSHES
Start by choosing the the pic u want to convert to a brush. Pics with good contrast are better. Then u select the part u want to turn into a brush.
After u select it go to...
Edit
...Define brush preset...
Select a name for your new brush and then press ok.
Its better to use big images for brushes as u can use the brushes for more things if they are big