When a task is assigned to a group with the Any option, it is available to all the members of the group. If you belong to the group, then it is available to you.
To assign the task to yourself:
1. In the Task List page, click the task name link in the Task column.
The Task Details page is displayed.
2. Enter or change the data as necessary.
3. Click Assign to me.
The task is assigned to you, and removed from the Available Tasks List.