1. On your web browser, go to your ninetails local.
2. Enter your username and password then click Login.
3. Select Item.
4. From the item list menu, search the item to update.
5. Click the the View button at the Action column then click Edit Item.
6. Enter the updated price on Sales/Price Rate.
7. Click Update.
8. On POS Console, select the dropdown under cashier's username and click Refresh Items.

You may also watch the video tutorial here:

How to Edit or Update Menu Price of POS on Ninetails