The next step is to pay the college fee ( minimum one semester )
If you are from India/Pakistan/Morocco/Senegal/Vietnam/Philippines/China
you have to pay full year fee to be eligible in SDS category visa
Otherwise just pay 1 semester fee
on your college student centre
your status will change from green tick to smile when the payment will reach there
After that college will give you a reciept by mail which you can use in visa process as a proof of fee payment.
If you want to apply under SDS Category then you also have to do GIC , But first get us know, where are you from ?