Step 1. Go to "Setup" on the Dashboard

Step 2.  Under "Settings", click on the blue button "Manage System Emails"

Step 3. Upload a logo to be used in all Emails if required

Step 4. You can edit all the emails listed (Admin & User)

Step 5. Once you click on any email form, the Editing Page appears as below. Make necessary changes and click "Update" to finish