There are 2 methods to retouch using sampled pixels.

Method 1:

1. In the Toolbox, select the Patch Tool.
2. Drag in (select) a damaged area with the Patch Tool** (exactly like with Lasso Tool)
3. On the Options bar, choose the Source mode.
4. Drag the selection (cursor inside the selection) onto a repair-source area (movie).

Method 2:

5. Drag in a repair-source area with the Patch Tool*.
6. On the Options bar, choose the Destination mode.
7. Drag the selection (cursor inside of selection) onto a damaged area (movie).

To retouch with a pattern, use Method 3:

8. Drag in a damaged area with the Patch Tool*.
9. In the Pattern picker, choose a pattern (movie).
10. Click the Use Pattern button on the Options bar.

* Available in Photoshop 7 and later. ** You can also create and edit a selection (beforehand) with any selecting tool and then choose the Patch Tool.