To add one tag is no problem - it works.
But how to add more than one tag? When I try to add another tag, there pops up a little window with "there is a problem to store the tag" (or something like this).
I have had some trouble with the HabitCal too. I am going to try it again now and will let you know if I find a way to get it to work! In the meantime lets both keep No-S'ing! Good luck!
So the "show" button is the "load" button, first off. Saving multiple tags on your calendar I think is your other question...
First of all I like to use the "table view" rather than the calendar. This way you are looking at your whole month and can check off days that you do your workout or fail at something, etc. and hopefully not the later. Anyway, sounds like you know how to add habits and tag days, now there should be a button that will say "Save ___ changes". If you click that it should save your tags.