Across the top of the details area you have 4 areas of focus: Home, Candidates, Profiles, Requests, and Tools
Home

Candidates:

Profiles:
When you have a profile selected in the calculation area this area will display those details, this information is purely informational and can’t be edited.

The upper right area of the profile is where you can add, copy, and focus the plot to the profiles bandwidth. if you are looking at a custom profile you will also see an edit button and a delete button:

Creating a new profile: Click the plus icon to start the process of creating a new profile.
Click the copy icon to duplicate your current profile that you can then edit
Click the edit button to change the current profile
Click the trash icon to delete the profile (deleting a profile will not affect projects that have used that profile in the past.
Click the magnifying glass to focus the plot on the current profiles bandwidth