Custom Field

My question is how can I add a custom field to choose whether he is student or teacher on my registration page when registering through login with facebook

Here is my site URL:
http://99creativewebsite.co.in/ilprep/

& login , Signup url

http://99creativewebsite.co.in/ilprep/?login=http://99creativewebsite.co.in/ilprep

http://99creativewebsite.co.in/ilprep/select/
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