I think it is ([FieldName] Mod 2) = 0

The syntax for MOD is:   (Number)  MOD  (Number)  See Glossary:  MOD

To use conditional formatting with a field you would choose "Expression Is"
In the expression box you would enter the expression as
              [FieldName] MOD 2 = 0

So if you were looking at FamilySize from the Sample Template it would be:

       [FamilySize] Mod 2=0  

Note - you need the brackets ( [ ) and ( ] ) even if your field name doesn't have spaces.

Then choose the formatting you want for that condition.

I give up, Access is just to sensitive...LOL (Just Kidding)   I changed the code from "Mod"  To "MOD"  all caps and it worked.. It's the little things that ya gota pay attention to. Thanks Scott

This may actually be a glitch in my system.  when I typed with lower case it gave me syntax error.  When I typed in all caps it accepted it and then changed it back to Mod  I went back in and deleted and tried with lowercase again to get that error and it did not happen.  go figure, thanks again for your help

Access is not case sensitive.  Don't know what it was unless to hit m0d and not mod?  (zero)
Who know?
If I have something that just isn't working and I know it should, the first thing I do is sut down Access and restart.  sometimes a restart of the computer too.  Clear out the memory.

More than likely it was me, I would have put money on it, that I typed it correctly. However, Next time I get something goofy like this, I will reboot,  Good Idea.  Thanks again you guys are the best!