URGENT: Question regarding administrator password

Hi! I would like to install a new app but when doing so it tells me to drag the app into the applications folder. However, to do that I would need to enter the administrator password and when I do it says " Authentication is Disabled". I'm not sure if this is because I forgot my password or what because when I tried to reset my admin password with the terminal resetpassword method, it doesn't let me for some reason. Help is greatly appreciated! Thank you!