To be able to receive trade offers on Dojo through Steam, you must enter your Trade URL. Please also make sure that Inventory privacy settings on your Steam account are set to Public.
You can get your Steam Trade URL here
Trade URL
Optional: you need to have the Steam Guard Mobile Authenticator enabled for at least 15 days. If we send you a trade offer without this protection, the trade will be withheld by Steam for 15 days.