If you realize that you have a contact that should be linked with a user account, then in the Contact Record click the Admin Actions dropdown menu on the top left. Then click Link to an existing user.
![](https://disciple.tools/wp-content/uploads/image-37.png)
Find the corresponding user and click merge.
A user will already be link with a contact record, so we need to merge the 2 records.
![](https://disciple.tools/wp-content/uploads/image-38.png)