To access your Reseller Web Based Control Panel go to
https://yourdomain:2087/or much faster but insecure link at
http://your domain:2086/
Before your DNS zone will be fully propagated you can change "yourdomain" with the ip from the server your account is.
Look in the "Account created" email the section "Account Information",
------------------
Domain name: xx.x
login : x
password: x
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(Hostony provide usually the same password for both cpanel and whm panels (and ftp, etc))
For more right info look in the email the section "Web Based Control Panel for Your Reseller account"
If you can't access with this info... i think you will need submit a support ticket at support.hostony.com.