I am new to vm2, I had entered all the details of the produce, I did not want to write cost and just want to write final prize to show, but when i write price in final price and save it does not get save why?
There must be a cost price. All other prices are calculated from that one, so your tax rules and profit margin calculation (if you are margin based) are applied to the cost price to obtain the final price. If you just want to enter the final price then VM can work backwards to work out what the cost price should be. Just select Calculate the Cost price on the price editing pane and save.