You can navigate to your Work Requests tab from the My Work area of Workfront. 

You can see the My Work area of Workfront, if you have any of the following access levels:

• Worker
• Planner

Requestors cannot see this area, because they are not assigned work.
Reviewers see the My Updates area instead of the My Work area. For more information about My Updates, see "Understanding the My Updates Area." 

For more information on the Work Requests tab, see "Work and Team Requests."