edit page layout function not working in CRM leads section

edit page layout function not working in CRM leads section

I have confirmed I am paid via Zoho invoice.  And I have logged out and re booted twice.
When I go into Setup and try to edit the leads layout page, I get a "not available"  message or a message that Internet Explorer is not working.  Yet all my other Zoho CRM pieces are working... I can add new leads, edit leads, sort leads, etc.
Very frustrating. I have a lot of work for the next five days before presenting this system to the client (I am footing the bill while I prepare the presentation and database loading). 
 
Anyone know how to fix this?
 
Thanks,
new user in Michigan