Click on the Freewallet logo in the upper left corner of Freewallet.
Freewallet logo button in upper left corner shown with Red Arrow
Your Freewallet version as well as what Counterparty Protocol API version you are interacting with will then display under the Freewallet logo in the “About FreeWallet” popup:
Freewallet version shown with Yellow Arrow and Yellow Box
This is also where you can check for new updates, read the License Agreement, use the Donate button or use the Debug function when errors arise.