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To find your Steam Trade URL you should follow these steps:
1. Log into Steam Client and open your Inventory.
2. Click the "Trade Offers" button on the right.
3. Click on "Who can send me Trade Offers".
4. Your Trade URL can now be copied and pasted in Lootcase.io
Here's a short video that might help: https://youtu.be/Pz25jPcALbQ
Enter your phone number in full format with +. And click confirm.
An SMS with a one-time code will be sent to the number you specified. Enter it and complete phone verification.