You can select trade locked item and make reservation simply by pressing TRADE button.
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Item goes to your inventory 'Reserved' tab – please refresh your CS.Trade's User Inventory.
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Once item is tradable, you can withdraw it. You have 72 hours to withdraw the item. If you fail to do so, item reservation will be automatically cancelled and you will receive 101% of current item price added to your balance.

You can cancel still trade locked item reservation. You will receive 97% of current item price.

If you choose to cancel tradable item reservation you will receive 101% of current item price.

You can access your reservations history and details here.