This page lists all the communities of which you are a member, making it simple to unsubscribe from communities you no longer need. However, your administrator might have made your membership in some communities mandatory (displays Community is mandatory. You cannot unsubscribe from it.).
To remove yourself from a community:
At the bottom of any community page, click Unsubscribe Communities.
Under each community from which you want to unsubscribe, click Remove <community name> from memberships. The community no longer displays on this page.
The communities to which you unsubscribed no longer appear in your My Communities menu.
To see a list of access keys that allow you to navigate the portal with your keyboard, refer to Access Keys.