You will want to thaw the mouse in hot water. Make sure the water is not boiling hot or you will cook the mouse. Check to make sure the belly of the mouse feels a little squishy and not hard, this will be an indication that the mouse is fullly thawed. Then take your feeding tongs and simulate that the mouse is alive and danlge it in front of your snake. Try not to get it to close to the snake's head or it might become frightened and not take it. If the snake does not take it from the tongs then you can proceed to leave it the enclosure with your snake. Good Luck!