I don't know how to cancel the registration time of dispatch.

If you forget the registration time of dispatch, you can try the following methods to find the registration time:

1. In the scheduling client, click the "Message" button, and then select "Settings" →; "Account information".

2. On the account information page, you can find the "Registration Time" field, and click the "View" button to view the registration time.

If the above methods still can't find the registration time, you can contact the dispatch customer service, and they can provide more detailed help.