Only ACS and A30 Aurender models can rip CDs on their own. Instructions for ripping CDs with an Aurender ACS can be found here: Ripping CD's with ACS10.
For all other Aurender models, we recommend using a Mac or Windows PC to rip CD's. It is recommended to rip CD content to an internal drive on a computer, or a USB external drive or NAS drive, and then transfer the content to the Aurender using one of the transfer methods available.