1. First, open the word document on the computer desktop.

2. After entering the word document, enter the three symbols "-"continuously.

3. Press the Enter key on the keyboard directly after input, thus inserting a straight separation line.

4. If you need to insert a wave separation line, you can directly enter three "~ ~ ~" and press enter.

5. If you need to insert a thick separation line, you can directly enter three "# # #" and press enter.