My Net 750 add new Fastrack

Hi there all of you. 
I just buy this router and i like to set a new fastrack
There are the default one like YouTube, Skype, etc but i like to add new. 
How to do that because i don't se anywhere in help manual how to do this for a particular website!

To my understanding, you wont be able to update the version of one of the applications that comes with the firmware of the unit.

Make sure that you have the latest firmware installed on the device to see if the new version is available on that firmware.