How to delete "Service Fields" from the Service Catalog "Form Designer"?

 

I have a few that are redundant, and I want to remove them from the Service Fields list.

 

Thanks.

 

Senior Client Technology Support Analyst
Bird Construction Inc
http://www.bird.ca
http://ca.linkedin.com/pub/carlo-piva/31/267/a5b
http://ca.linkedin.com/pub/carlo-piva/31/267/a5b