If you're registered for an event, whether you can unregister yourself depends on how you got registered in the first place. This article explains when the self-service unregister option is available to you, and who can unregister you when it isn't.
Events You Registered for Yourself
If you registered yourself for an event, you can unregister yourself from it at any time before the event starts.
Events an Admin or Manager Registered You For
If an Admin or a manager registered you for an event instead of you registering yourself, you won't see a self-service option to unregister from it. There is no individual permission that can be granted to change this — the ability to unregister yourself depends on how you were registered, not on a setting applied to your account specifically.
Requesting an Unregistration
If you need to be unregistered from an event you didn't register for yourself, reach out to an Admin, your Training Manager, or a manager with the Register Members to Events permission — they can unregister you from the event on your behalf.