Click the buttons just like you would on a normal calculator. Every time you click the settings button it toggles on/off the settings panel.
[Update 2.0 Additional info] This release in not fully bug-proof, but so far I have found none. (See below for what is included in this update) [Update 1.5 Additional info] I had to shift around the orientation of the number buttons a little. (see below for what is included in this update) [Update 1.0 Additional info] Delete button and minus are not implemented yet but will in future versions. Will add button colors: blue, green, yellow. ---------------------------------------------------------------------------------------------------- [Planned Features] Adding: Delete button, multiply button, divide button, sounds/music, settings button, decimals, more button colors ---------------------------------------------------------------------------------------------------- [Update History] V1.0 Original release- V1.5 Added: Minus button, Zero button, settings button, sound/volume slider, black and red button color choices. V2.0 Added, Blue and greencolor choice, more backgrounds to choose from!