The top of your Inbox displays your availability to receive tasks.
To change your availability to receive tasks:
Click Inbox.
At the top of your Inbox, click I am available or I am currently set to unavailable.
Do one of the following:
To make yourself available, deselect the checkbox that changes your status to unavailable.
To make yourself unavailable, select the checkbox that changes your status to unavailable, then click edit, then select another user to receive your tasks, and then click OK.
When you make yourself unavailable, this only affects future tasks that have been marked as delegable. This option does not affect tasks that are currently in your Inbox or any future tasks that do not allow delegation.