Help with changing the Information on the Dashboard Project Tracking & Rollup

Hello! This is my first time using smartsheet and I am currently working on a project plan for which I would like to edit the Dashboard project tracking and rollup information. In the section labeled "Add project contacts," I am not able to alter the names that are listed in the project manager, portfolio manager, and VP space. I am able to edit the "titles" but not the names; is there any direction or help on how to do this? Thank you!

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