How to connect custom fields to custom post type in CustomPress

Hi everybody
I have CustomPress plugin installed in my network.
I have created a custom post type and some custom fields that I wanted to connect to this custom post type. However, this custom post type does not appear on the list of post types that custom field can be connected with.
Custom fields are enabled for this custom post type.
Can you help me how to make it work?

best regards
Paulina