Tools: pictures.

1. Open the picture: open the picture to be signed on the mobile phone.

2. Select tools: Select appropriate signature and date adding tools, such as memos and picture editors.

3. Adjust the position: Before adding the signature and date, use the tools in the picture editor, such as free transformation and cropping, to adjust the picture appropriately, so as to better arrange the position of the signature and date.

4. Add a signature: Add a signature to the picture. You can choose to use handwriting mode to write your signature directly on the picture, or use text mode to enter the signature content. Adjust the color, size and transparency of the signature to blend in with the background of the picture.

5. Add date: Add date to the picture. You can also choose to add the date in handwriting mode or text mode. Adjust the color, size and transparency of the date to blend in with the background of the picture.

6. Align elements: In order to align the signature and date up and down, you can use the guide line or the alignment tool to make adjustments. In the picture editor, there is usually an alignment tool or guide line tool that can help you align elements to a specified position.

7. Save the picture: after adding and aligning the signature and date, save the picture.