mobile app help sought

[ISB]

hi

could someone please help me to understand the IOS mobile app, dealing screen?

if i want to buy shares, at a price less than current market, on the "deal' tab, why does it only show Stop & Limit distance as "points away'' and not att a set price?

if i go to the 'order tab', I can set a price, under 'order level', and order type as 'stop' or 'limit', but then, at the bottom, it still shows 'stop distance' and 'limit distance', as "points away"--what is this?

thanks in advance.

ian