You will find the URL address needed to complete the transaction by going to your inventory and clicking the "Trade Offers" button.
![](https://gamerhash-com.ams3.digitaloceanspaces.com/editor/assets/o8iVD0qM9jgYYipkNIoVx9qav5fEX7zlOxxzHE4f.png)
In the next window, select "Who can send me Trade Offers?" in the right-hand panel. The link is available on its left side. Select an address by clicking on it and copy it (ctrl + c).
![](https://gamerhash-com.ams3.digitaloceanspaces.com/editor/assets/YMPMY90lsrSEPxinXlYLdWfoYyk9edEPZW64hTmi.png)
Now you can paste the link in the appropriate field when buying the skin.
Note the message below the Trade URL panel: inventory Privacy must be set to Public in order to receive trade offers.