To add/delete/edit any email on your website account,

Go to your Metrotecs Client Dashboard.
https://metrotecs.com/dashboard 

Go to the SERVICE SECTION and click on your domain name.
When drop down opens..   Click Login under the OPTIONS column..
This will log you into your cpanel account...

Once you are logged into your cpanel account,
Go to the: EMAIL section...
click on EMAIL ACCOUNTS...
Once you are here, you can add/edit/delete any email account on your domain name.