Access to support?

Dear all,

some weeks ago (maybe some months..), i was able to access to the site Support.quintiq.com and i can't log in anymore. 
I can't find a contact to ask why and how to solve it so i'm asking the question here.

On this support site (link in my quintiq software), i was able to find the description of all function of the software. Maybe there's another site for that and this one doesn't work anymore even if the link is still in my soft.

For example, i would like to have the description of the function "selectset"

 

many thanks by advance.