You can find the nameservers info inside the "New Account Information" email sent to you at the time of signup!
Typically, the nameservers are:
ns12.ssdpage.com
ns13.ssdpage.com
However, it may be different depending on the server you're hosted on, so it's best to check "New Account Information" for your nameservers.
Let us know if you have questions by emailing us at hosting@ibraininc.com.