Afilias is the official .INFO registry operator designated by ICAAN
If you have purchased a third party nameserver, then I would do what seiler said.
If not, I read the ICAAN agreement between Afilias and ICAAN
"On 11 May 2001, ICANN and Afilias entered into an Unsponsored Registry Agreement under which Afilias operates the .info top-level domain."
So, if it is your own nameserver, you need to register it with Afilias.
Sorry Lone if I am misinterpreting you...it wouldn't be the first time I was confused on a friday...I am just trying to help.