Edit a cell comment. To edit an existing cell comment, follow these steps: Select the cell with the comment you want to edit. On the Review tab, in the Comments group, click the Edit Comment button.The yellow comment box displays. Make any desired changes to the comment, and then click outside the comment box.dit a cell comment. To edit an existing cell comment, follow these steps: Select the cell with the comment you want to edit. On the Review tab, in the Comments group, click the Edit Comment button. The yellow comment box displays.