trying to edit a dropdown list (can’t open the dropown list)

I have heard many good things about this visual css editor and decided to check it out before buying.
I have a dropdown currency switcher and I want to edit the dropdown list, to do this I have to click on the switcher to open the list of options, however when I click it keeps selecting the option that is visible.

Is there a way to open the drop down list and edit it?