WD N900 router

I am trying to set my N900 to wi-fi access point to boost home coverage on a new internet server.
Do I use the password from my original server?
I have reset my router to factory settings. It refuses to use the original name & password I.e. admin & password.
Please help

In order to use your WD My Net N900 Router as an access point/extender, please follow the instructions provided in page 68 (72) of the user’s manual.

Thank you Trancer. I managed to reset to factory settings then followed the instructions.
It now works perfectly in access mode