1. Log into the Wordpress dashboard
2. Go to the Team / All Team Members screen, and enter the name you want to edit in the Search Team field.
3. Click the entry to edit.
4. Edit categories (select only one category per entry) and Featured Image. Then click Update to save.
5. If the Featured Image palette does not appear on your screen, click the Screen Options tab at the upper right:
A control palette will expand from the top. Click the "Featured Image" checkbox:
6. After you have made your edits and clicked the Update button, refresh the frontend to check your changes.