If you want to go for an appeal against the order of Assessing Officer, you’ll have to go as per Sec 246A of IT Act not as per section 249 as mentioned by AMIR .In which you can make an appeal to Commissioner of Income Tax in prescribed application form 35 within 30 days from the date you received such order from A.O.
For your kind information it hereby to aware you that the detail procedure is mentioned U/S 246A and not in 249. For more detail please go to the link as given hereunder.