The main screen shows two hands holding a string, to which you can add beads to make a pattern. Drag the beads from the dock at the bottom onto the string.
Clicking on the pull down menu labelled ‘1 lace’ will allow you to change the selection to 2 laces.
Clicking ‘Clear all’ will remove all of the beads from the laces. Clicking Reset undoes any changes you have made, returning the tool to its default state.