The version of Machform is noted (or should be) under the Administration "Settings" link.
Note that MF is currently at Version 6.1 so you're a long way behind (if in fact using 3.2)
You need to put the "column_2" in every column for which you want two columns
e.g. fields called
Name ___________
Email ______________
adding "column_2" to both those will show the layout like:
Name_____ Email_____________
If you wanted three columns e.g.
Name _______
Email ________
Phone _____________
Put column_3 in each to give you:
Name_______ Email_______ Phone ______________
Also as the documentation says, there are some fields it won't work with.
I assume you're trying to layout columns for the standard text field types like name, phone, email etc.