1. Login in to your CPanel 
2. Go to Email Accounts
3. Click on Connect Devices 
4. Take note of the Secure SSL/TLS Settings 
5. Go to Gmail.com
6. In the top right corner, click the Settings button
7. Select Settings from the drop-down menu
8. In the Settings screen, click the Accounts and Import tab
9. Scroll down to Send mail as and click Add another email address you own
10. Write the name and email you want to add
11. Click Next and write the data you got from the CPanel Page.
12. Now send a test email and make sure you change the "From" option to your new email