Do you know how can I sell my splinterlands souldbound reward cards?

Greetings friends!

I noticed that splinterlands is showing price of the soulbound reward cards. It means now these cards can be rented or sold in the market. But, when I tried to sell one for trying, it could not be done. Do you know how can I sell my splinterlands souldbound reward cards? If yes, please let me know.

• I know.

• I don't know.

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