How do I add the function for my form to self calculate cells?

How do I add the function for my form to self calculate cells?  I have several that I want to add together but can't figure it out.  When I'm in "prepare form" I right click on the cell and select properties, but there is not "calculate" option like I see in all the tutorials.  Should I be in "prepare form" for this, or where should I go?

Also, why don't I see all the tabs that I can see in the tutorials?  I only have General, Appearance, Position and Options, but in the tutorial I see: General, Appearance, Position, Options, Actions, Format, Validate and Calculate.