Your BitSkins account has a permanent Litecoin Deposit Address, which you will need in order to withdraw funds from Idle-Empire to your BitSkins account.
In order to find that address, simply follow these steps:
- Visit your BitSkins wallet
- Click on "Litecoin" in the "Deposits" tab
- Click on "permanent Litecoin deposit address"
- A popup will open that displays your Litecoin Deposit Address
Here's a video showing the process: