How?

1. Open the Vivitar app: Launch the Vivitar app on your device. Ensure that you are connected to the camera or device you wish to control.

2. Select the media file: Choose the media file you want to play and locate the playback controls. These controls are typically displayed at the bottom of the app's interface.

3. Locate the fast forward button: Look for the fast forward button among the playback controls. It is typically represented by a right-facing arrow that may have multiple lines following it. This button is used to accelerate the playback speed.

4. Tap the fast forward button: Tap the fast forward button once to start the fast forward playback. The playback speed may vary depending on the app's settings, but it is generally faster than normal playback.

5. Adjust the fast forward speed: Some apps may offer options to adjust the fast forward speed. If available, you can tap multiple times on the fast forward button to increase the speed progressively.

Alternatively, there may be a separate option within the playback settings to adjust the fast forward speed.

Note: The specific steps and appearance of the controls may vary depending on the version of the Vivitar app and the device you are using. Make sure to refer to the app's user manual or help section if you encounter any difficulties finding or using the fast forward function.