Step 1: Login in your client area.
Step 2: Go to, My Products & Services and here all of your services will be listed.
Step 3: Open your Shared hosting Service.
Step 4: On the left side, you will find the following options:
Step 5: Just press on the option "Login to Webmail."
Note: If you don't find this option under your product & services. Kindly open a support ticket.
That's it !!