Limit Orders aim at closing positions at off-market price. These orders will execute when market value of an Instrument reaches the Limit price set by the trader.
In general, Limit orders aim at closing positions at price higher than current market price.
Using your BlackBerry track wheel navigate towards the trading account / position you would like to view, from the list available in the Positions Screen
Press the track wheel and choose Select from the side menu

You will be redirected to the Position View screen of the Position you have chosen.
Press the track wheel once again and select Limit Order function from the side menu.

You will be rerouted to the Limit Order screen where it is required to provide pricing details.
There are several displayed fields:
Trade: Position ID number and Instrument
Base: Account Base Currency
Lot: Number of lots / mini lots
Your Rate: Your new price has to be higher than the current price
Required Rate Field: Trader enters his/her Rate in this field
Using the track wheel scroll to the bottom field and enter the numbers you think fit best. (In this case your Limit price must be higher than 1.5173)
Once required field is filled in press the track wheel and choose OK
LIMIT ORDER SCREEN

Once confirmed you will be redirected to the Position View screen for the position you have just worked with
Scroll down to the Limit field where you should be able to see the Limit Order you have just placed for this particular position