issues with EMAIL tab not showing up..J

I have had my manager set up the email add on feature. My manager is NOT using the mail add on, its only me that is using it. We gone through the processes of setting up the mail add on and making sure that I am activated on it. The problem is that I dont have a EMAIL tab at the top of my TAB bar where Leads/contacts/activities ect are located.

Does anyone know what we can do to fix this issue? I am not getting read reciepts when I send out an email from the CRM, however I get no emails sent back to me (read receipts) and dont have access to my full email in zoho.

Thanks