The first is to use the duplicate management tool, that houses the entire list of potential duplicates.
- Click the +sign in your available tabs
- Click Duplicate Management
- There will be a list of potential duplicates that you can choose to Resolve from this page.
- Go to the Contact record for the user
- Click the Find Duplicates Button
- If there are duplicates the following text will be displayed next to the Find Duplicates Button, "X potential duplicates found" where X is the number of potential duplicates.
- Click on this text if displayed.
- You will then be able to resolve the duplicates.