Find applicants under Recruiting › Applicants or on the dashboard of any relevant Job Posting. See How to manage applicants and How to manage your job postings for details.
Choose who the email appears to come from. Enable This is a no-reply email if you do not want responses.
Select a template from Templates to autofill the Subject and Body. Learn more in How to create email templates.
The applicant is now marked Contacted on the Job Posting dashboard, and the email appears in their Activity tab.