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Here are the steps required to build the use case diagram:

1. First, set the context of the target system. Click the System button to add the system icon to the diagram.
2. Now double-click on the new system icon to add its name.
3. Identify the actors. Click the Actor:person button to add actors.
4. Double-click either actor to add its name.
5. Click the Actor:system button to add another actor.
6. Double-click the new actor to add its name.
7. Identify the use cases. Add three use cases by clicking the Use Case button.
8. Double-click on any use case to add its name.
9. Define the associations between actors and use cases. Click the Association button to add associations connecting all the actors to their appropriate use cases.
10. Evaluate the actors and use cases to find opportunities for refinement. Click the Actor:person button to add a Preferred Customer actor.
11. Now click the Use Case button to add a Preferred Customer use case.
12. Click the Association button to add an association connecting the new actor and use case.
13. Evaluate the use cases to find opportunities for delegation. First, add associations between use cases by clicking the Association button.
14. Now, double-click either new association to add the <<Uses>> stereotype.
15. Evaluate the use cases for special cases. First, add associations between Deposit Money and Preferred Customer Deposit by clicking the Association button.
16. Double-click on the new association to add the <<Extends>> stereotype.
17. This completes the use case diagram.