If you have a Facebook account, you can use the alternative sign-in method provided on main page of Rentalz OnDemand.
Go to https://www.rentalzondemand.com.au/
and click the 'Sign in with Facebook' button.
First time you will be redirected to page where you have to submit your Rentalz OnDemand username and password to create the initial link.
Next time use the 'Sign in with Facebook' button to go directly to the document list.
You can release the Facebook ID from your account if you click the 'Manage my Account' link in the document list, then click the 'Release my Facebook ID' link.
This may be useful if you want to link your Facebook account to other Rentalz Ondemand account.