Go to your Cpanel Webmail

You can login to your webmail by going into your cpanel account. and click email accounts, in the second page, there is a link to your webmail.
webmail link click the webmail link, you will go to following page:

Click “Got it” and you will go to following page:

Select the webmail application you want.

You can also go to your webmail account directly. After adding email accounts, you can check them through cPanel’s built-in webmail clients (Roundcube, Squirrel Mail, and Horde Mail) by going to one of the following:

• http://your domain name/webmail
• http://webmail.your domain name

After logging in, you have to choose which webmail client you want to use.