I can not collect my free domain

I am enrolled to full stack engineering course, and I have a free domain name for a year on namecheap but I can not collect it.

When I am logging in to namecheap with the provided link after choosing my domain name, it is directing me to the payment page with 7.99$ to pay…

How can I collect my free domain

You might want to consult the help pages on namecheap.