If you have the original Grace Internet Radio, it looks like you have to go online to configure your Grace radio with Pandora before it shows up as a menu option. The user manual says:
Create and log onto your Reciva account at https://radios.reciva.com/. Please note that you must follow the steps in ‘Registering
An Account On Reciva’s Website’ prior to upgraded your radio to be able to receive
Pandora music stream. If you have not signed up for the enhanced services please go
back to that step.
After you have successfully logged into the reciva web site choose ‘ enhanced or
optional’ features. In this menu item you will choose ‘activate Pandora’ ( please note from
time to time the actual verbiage used in the on line steps will change). You will then be
prompted to add your pandora ‘user name’ and ‘password’. After you have done this
please unplug your radio from power and wait 15 minutes. Plug the radio back in and
turn the radio on. You will now be able to listen to your Pandora stations on your Grace
digital radio.
You can then listen to your Pandora music section via the following menu choices. Select
‘My Stuff’. Then select ‘My Pandora.’
If it’s not the original model, you can find the other manuals here.