Enable CSC remote signing for Adobe Sign

I have a TrustPro account (CSC remote signing provider integrated with Adobe Sign) and I want to be able to perform digital signatures using that service in Adobe Sign. TrustPro told me that I need to ask Adobe to activate this for me, but I can't find a way to open a support case for this. When I try to ask for support via the chat it tells me to contact again during working hours but it happens that I don't working during Adobe working hours and I cannot find any way to simply open a support ticket.