Okay, thanks for clarification (I'm still learning!).

I'm not actually making an application, i'm simply editing existing files and seeing what happens, basically fishing for ideas to customise my device.

In this case, I wanted to go directly to the alarm dialog page by tapping on the time on lockscreen. This means, I have directly edited Clock.qml, found in '/usr/share/lipstick-jolla-home-qt5/lockscreen/*'.
To make this happen, I used MouseArea to make the time clickable and it opened the application settings for Openrepos-clock-settings (a .qml file) - success!, but when it comes to opening say, a file or desktop file, nothing happens.