"New PictureTrail members are assigned a free Intro Account. After 31 days, they are switched to the free Basic Account if they have not already upgraded to the Premium account level. Free Basic accounts are eventually phased out from the system if not upgraded to the paid Premium level."
But there is no information about the 'paid Premium level'.
So you sign up for free, commit your IP to their site and then they tell you how much it is going to cost for what level of service.