Hello student yes as you know FMGE application form is Rs 5500 you need to pay it online as you said you didn't paid that yet so just complete your application form by paying the application fee once you successfully pay the amount it'll automatically submitted and you'll get a notification on your registered mobile number /Email address.

Make sure you pay the application amount before the last date which is 31st October.

Feel free to comment if you have any doubt

Good luck