How can I edit the requirement for a particular positions?

Editi JD option is given at home against the position name. There are two ways in which you can modify the requirements, if you want to send the quick update then you can use the quick update option or else you can use the edit JD option to modify the job specification or upload a entirely new JD. Any changes you do will be sent as a notification to all the consultants who have signed up to work on that position.