How to recover a password on a DLINK router?

Hello,

I just started working at this new place and the office where I am, there is an internet conection with a router for wifi , but the person that used to work here, looks like he had a specific passoword for the router and I can't have access to it to see the wifi passcode. I tried typying the "admin" which is by default, but it didn't work. Can you please help me to recover that password so I can have access to the router. Thanks A lot.