How to activate and receive your skin:
1.Go to DROPLAND.NET and click "Sign in through STEAM™" Enter the code that you have received.
2.Save your Steam Trade URL on profile page
3.Enter the code next to the button "redeem code"
4 Afterwards you will be redirected to the page with case, where you can open your case 
5. Once you open your case, go to your profile and take your prize , by clicking "Get". 

Note: to receive your skins, your inventory must be open public account should have no currency restrictions.