If you are having problems seeing the Email Scheduler app from within your Salesforce account, you'll want to check the following:
1 - Go to Setup -> Installed Packages
2 - Check to make sure the Status shows "Active". If it does not, then you'll want to check your subscription details on the AppExchange.
3 - Click on Managed Licenses and verify that your particular user account has been granted access to Email Scheduler
Still having problems? Please contact us for assistance.