To redact in Reveal, you must toggle image view in the top left of the document viewer, click the "Create Redaction" button, drag the crosshair cursor over the area to redact and then save the redactions before moving on.
Step 1: Push the "Image View" button to access the redaction feature.
Step 2: Once in image view, push the "Create Redaction" button to enable the redaction feature.
Step 3: Once redaction mode is enabled, the cursor will turn into crosshairs. Press and hold down the left button on the mouse and drag over the area you want to redact.
Step 4: Save the redaction before moving on to the next document by pushing the "Save Review" button.
NOTE: If Image View button is "untoggled" (not selected), you will not see existing redactions. To see prior redactions, image view must be enabled.