Step 1) While Logged in, click the “My Projects” navigation link, located below the Developer Portal banner:
Step 2) Click on the project link that you would like to update:
Step 3) On the Project page, click “Create New Key” for the application that you would like to create a new Developer Key:
Step 4) If you have 2 or more keys for an application in a project, you may delete unused keys by clicking the “Remove” button which is located to the right of the key: