At home when I am working in a table, to add or delete a row I just
select any cell and right click. The menu has the options I need. At
work when I do the same thing the menu that pops up does not have the
same options and will not let me add or delete rows, columns, etc. Any
ideas?

I prefer using Cadig TableBar, it's freeware.

i downloaded tablebar and when ACAD started the toolbar was there but
when i click on any of the icons i get a message in the command line
that says unknown command. When i download where should i save the new
file? Is there something else i need to do to get the tablebar toolbar
to work? The video demo on the website looks like it will do what i
need.
thanks

It may be problem violated by addon, please contact developers Cadig TableBar.