Need help for game I'm porting

So me and
My friend made this game called flush with scratch a while back. And it requires some dragging of images and I want it on html5 and all of the iOS devices so how do I do the dragging of images? Please do it as simple as possible the game was simple clog the toilet you win.
My friend made this game called flush with scratch a while back. And it requires some dragging of images and I want it on html5 and all of the iOS devices so how do I do the dragging of images? Please do it as simple as possible the game was simple clog the toilet you win.