The jitter special effect function in the clip is located in the "Special Effect" module, and the specific steps are as follows:

1. Open the clip video editor, select the video material that needs to add jitter special effects, and import it into the clip.

2. Select the video material to add jitter special effects in the timeline, and click the "Special Effects" button below.

3. In the "Special Effects" interface, you can see various special effects options, including "Dynamic Special Effects", "Transition Special Effects" and "Filter Special Effects".

4. Find the "Jitter" option in "Dynamic Special Effects" and drag it to the video material.

5. Adjust the strength, direction, speed and other parameters of the jitter special effect until it is satisfactory.

6. Click the "Save" button after completing the special effect adjustment.