As follows:

1. Open the document, place the insertion point in the document where you want to add a signature line, and then click the Insert, Text, Microsoft Office Signature Line button.

2. Open the "Signature Settings" dialog box and enter the proposed signer's name, position, email address and instructions for signing in the corresponding text box (note: optional); if If you do not need to display the date of signing, uncheck the "Show signing date in signature line" checkbox, fill in the form, and click the "OK" button.

3. At this time, the signature line is automatically inserted into the document, and the effect is as shown in the figure below.

4. Then add a handwritten signature. First, the signer writes the name on a piece of white paper. Then use a scanner to scan and save the signature into an electronic image format, such as .bmp, .gif, .jpg or .png format.

5. Select the created signature line, right-click the mouse, and select the "Signature" command in the pop-up shortcut menu.

6. Open the "Signature" dialog box. If you want to add a printed version of your signature, type your name in the box next to the "X". If you want to add a handwritten signature, click the "Select Image" button, select the desired signature image in the dialog box that opens, and then click the "Select" button.

7. After completing the above operations, click the "Signature" button. At this point, the signature effect can be displayed in the document.