To Reset the email Password:

1. Login to your cPanel using your said URL normally it should be your website and then add /cpanel example   "http://yourwebsite.com/cpanel"  beware you should not have "www" in the front otherwise it becomes the website
2. Once you logged in, please find the section "Email" or "Mail" Click on "Email Accounts" and you will see all the emails which you have currently.
3. Now If you have your email in the list you can select that email and click the "Password Aunthetication"
4. And now you can reset the password by generating a unique password by clicking the Link below "Generate Password" or You can pur your favorable either way... 

In case you need any help, please reply at the below.