1. Click the top right settings icon
2. Click “View all settings”
3. Click “Account & Import”
4. Find this section
5. Click “Add new email address”
6. Enter you custom email address
7. Complete your email SMTP settings and click save. This settings is set for you can use this Gmail to send email via this custom email.
8. Find this section
9. Click create new email address
10. Enter the email you want to received new email in this Gmail account.
11. Choose this option
12. Complete your email POP settings and click save
Now, you can send and received the custom email by your Gmail account!