Email from Leads donot show on leads page

Email from Leads donot show on leads page

Hi 

I am trying hard but nothing is working out.

1.
I could configure my pop account and the emails are very well showing there
but the emails that I receive from the lead does not show in the leads page.

2.
I have 4 accounts purchased for zoho, but they do not show under  Zoho Mail Add-on Users tab
Photo attached

Regards
Kapil