Selection of what?
Is the touchscreen working OK otherwise (if it is then it's probably a problem with this app rather than the touchscreen, whereas if it's working badly for everything that's a different matter)?
And what device do you have - this particular thread was about the original HTC Desire from 2010, and I doubt you still have one of those (OK, I do have one, but it's in a drawer and I've not turned it on for years).