YouStable users utilizes cPanel as control panel, so you can access site functions and features comfortably.
Method One: Login from Webmail
Step 1: Type the domain name and add webmail to it, and then hit enter.

Step 2: The cPanel webmail login page shows up on your screen, and enter the credentials shows up on your screen.

Step 3: Enter the right credentials, and then hit enter to login to the private email inbox.

Do not mistake; the cPanel does allow the users to log in to the private email from the webmail as well.
Method Two: Login from Dashboard
In case, if you have not connected the email to a domain, then you can access it from dashboard itself.
Step 1: Type the domain name and add cPanel to it, and then hit enter. I assume that you already know NameCheap utilize cPanel as a control panel for all users. Now, login cPanel using administrator credentials to access the dashboard.

Step 2: Type “mail” in the search bar, and click on “email accounts” in the search results.

Step 3: The number of emails created shows up in the list, and click on “access webmail” to open the inbox.

Now, you can access the email without entering the username and password or any credentials.