How to install D-link DIR 300 for MACBOOK

hi, i forgotten my wpa password when installing it. now i cant access the router. help me

You shouldn't need to install anything off the CD. Simply plug your Macbook into the DIR-300 via ethernet (making sure you manually set your Macbook's IP to 192.168.0.x (where x is anything from 2-254). Then open up your web browser and type 192.168.0.1 into the address bar. This will log you into the DIR-300 (I think the default login is "admin" with no password).

Refer to the manual for the configuration for the rest of your setup.