For a video on counting, see www.adobe.com/go/vid0030.
Use the Color Picker in the Count Tool options bar.
Choose Edit > Preferences > Guides, Grids, Slices & Count, then set the color in the Count panel of the Preferences dialog box.
Drag an existing number to move it.
Shift-click to constrain the drag horizontally or vertically.
Alt-click (Windows) or Option-click (Mac OS) to remove a number. The total count is updated.
Choose View > Show > Count.
Choose View > Extras, View > Show > All, or View > Show > None.