I'm stuck on this part of excel

On the Transactions worksheet, click cell R9, and then press F2 to enter edit mode. Select "Everything Else", including the quotes, and replace it by entering an IF function that determines if the value in cell P9 is less than the value in cell K21 on the DataInputs worksheet. If the value is true, then the result is the value in cell I21 on the DataInputs worksheet. If the value is false, then the result is the value in cell I22 on the DataInputs worksheet. Be sure to use absolute references where necessary. Copy the formula through cell R30.