How to Liquidate Polymath from Coinbase?

I bought Polymath as part of one of Motley Fool’s portfolios using Coinbase as the broker. At some point Coinbase stopped trading Polymath (my fault for not staying on top of it), so at this point I can’t sell it on Coinbase – it does say I can “send” it.

But, I have no idea where to send it to? Do I need another crypto account somewhere that still trades Polymath?

Does anyone know where it is still traded?

Thanks

Micky Cross