Need some help

To create a dating site with some paid membership, I really dont understand the difference of membership package and listing package? Shall a membership package refer to a listing package??

Another problem is when a user will create a profile on the dating page, the user cannot finish the creating of the Profile, because the user shoud fill out the field profile category?? What does proofile category means and why can the user not select somthing?
but the possibilities is this;
1 maxium categories. 0 selected. (0) View All Profiles Dating profil

Hope for some help