Is it for a vacation for February or beyond February? If it is beyond February then use the Vacation Move Up on the Vacation Bids screen.

If it is for February then Set Condition > Vacation Slide....Choose the Vacation you want to slide (in case you have two in one month, it can happen when you get really old like me) ..... then choose the number of days you want to slide the vacation. If your vacation starts on the 8th choosing -4 makes it start on the 4th. Choosing +4 makes it start on the 12th. You can also select a range of days and it will try to use the furthest out slide first and then work back through the range. You can also use the "Else Start Next" to try various slide strategies with different bid groups.