It's now time to retouch your image. Click and drag over the area you want to replace or correct and you will see the area you selected in step 4 start to "cover" your photo. Play around with different brush settings and try replacing different areas of your photo until you get the hang of it.
NOTE: Remember this tool can also be useful for fixing images other than photographs. You may want to quickly copy an area of an illustration or fix up a background graphic for a website.