No you cannot change the APPLICANT ADD on this system. Its only for viewing.
The option you are talking about is for folks who are about to land and have not given any add at the time of landing for the PR card to come. Applicants are asked to go to this link specifically at the time of landing ..till then you cannot use it to provide CANADIAN ADD for the applicant. The applicant is supposed to get the city,province of the sponsor to start things with and when they land usually the officer ask for a canadian add from the applicant so they they can send the PR CARD to that add.. sometime (brand new immigrants) do not have an add at the time of landing, in those cases they ask the new immigrants (after landing) to go to this link and provide the new canadian add so that they can send the PR card.
Till the file is in NEW delhi, do not use this link to change add for Applicant. Contact the ND office directly using there email/system if you want to change the INDIAN add...