Since you don't know what this app does or what it can do, there's no way you should consider trading/investing in anything.

To purchase/sell securities you must use the services of a registered broker/dealer and not a APP provider.

All major brokerage firms provide their customer with on-line services which include buyng and selling secuites.APP only providers can not do this,

Talk to your brokerage firm about getting access to their trading platform.

If you don't know the answer to this you are a danger to yourself. You need to sign up with an on-line broker. Then install their app. to use their platform on your iPhone

if you find out best HD Stocks apps for your iPhone/iPad then this the top 6 apps for you

Best Stock Market Apps for iPhone, iPad - iOS 7 and iOS 8

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I recently purchased the Stock Market HD app on my iPhone and I was wondering if I can actually purchase stocks using the app or if it's simply for following the stock market. Does anyone know?