If you open "Add connection(s): and start typing into one of the boxes, you should see a list of matching entries displayed, that you can choose from. eg if I type the word fire into a "Shows place(s)" box, it shows a list of Fires Stations for me to choose from.
If you used the Chrome browser on an Android phone, no list of matching entries was displayed.
I've made a change that fixes the problem on Android, but please let me know if you find it causes problems with any other web browsers.