You can login to cPanel by :
http://cpanel.yourdomain.com
http://yourdomain.com:2082
http://yourdomain.com/cpanel
You can login to WHM Panel by :
http://whm.yourdomain.com
http://yourdomain.com:2086
http://yourdomain.com/whm
You can login to WEBMAIL by :
http://yourdomain.com:2095
https://yourdomain.com:2096
http://yourdomain.com/webmail