Understand how you can view/edit a candidate's contact information.
Open the job which has the candidate whose information you want to edit. Once you find the candidate, click on it, this will lead you to the candidate's profile. Once you're inside a candidate's profile you'll be able to see contact information on the left side of your screen.
Clicking on the edit button will open a drawer on the right side of your screen. Make changes and then press the 'Save' button.