Aily

Hello good day ! I would like to ask some help and advice . 
 

Last 3 months , i received my nvc and when i read it . It stated that my visa class is f24 and it says that due to the numerical number im not eligible for the visa as of now . But i tried to calculate my prio date and my birth date and it says that i am eligible. SINCE i was confused that time i tried to ask help here in visa journey,  last 3 months ago . And someone advices me that i need to contact nvc that i am still under the (CSPA). So we try to contact the nvc and FINALLY they noticed our concerns and they change my visa class to F22 . So now i am eligible for visa and i already payed the AFFIDAVIT OF SUPPORT. So after we payed the AOS , we also try the next payment which is IV FEE But when i enter the IV FEE  which is me the applicant. I can't see any check box to process the payment ! And there is no amount of dollar if how much im gonna pay for it.  And i dont know what will i do next ? 
 

so if someone knows what to do . Kindly tell me pls huhu . I really need a help guys .