1. Write your signature on the paper and write it down with your mobile phone.
2. Open the Excel file to be signed, and click Insert-Picture.
3. Open the prepared signature file.
4. The signed picture is inserted into the form. At this time, move the mouse around the signature picture and hold down the Shift key to adjust the size of the signature picture.
5. Move the resized picture to the appropriate location.
6. Select a picture, click Color under the Format menu, and then select Set Transparent Color.
7. At this time, click the background of the signature picture with the mouse.
8. The background of the handwritten signature picture becomes transparent, so that the background color of the signature and the form does not conflict and looks beautiful.