Change Stage Names Across Top

Hi There,

I have changed the names of the stages but I do not know how to change those listed across the top of a lead and opportunity to match.

I changed Develop to Opportunity Identified and Propose to Proposal Presented; I also added Project Scope Completed and Verbal Commitment. 

Now what I want is for 4 stages to display across the top of the lead/opportunity; currently, the old ones are listed.  How do I change these? 

Thanks for your help!