Just made a new thread, the the latest Mac OS X version presented in the drop down list was “10.8”. 
Obviously this needs to be updated all of the 10.9 and 10.10 versions.
Here’s a screenshot:
So, since I’m running 10.9.5, I have to pick “Other”, but there’s no where to even enter the other OS.
This thread shows the same thing.
Hi Michael,
I don’t understand what your question is.
gl,
kel
Think I know now.
Just enter the latest os that is on the list. Ain’t no big thing if it’s the wrong os. You can always update it later on.
gl,
kel
ps. I have experienced your situation.
And bwt, if you want people to know more of your info, you can enter it it in the tags. I think that’s what it’s called. You can enter thinning like the os or whatever.
gl,
kel
A good point! I expect Ray (this site’s owner) will see your post, but I’ve just sent him an e-mail too.
I think kel1 may be referring to signatures. You can put your system details in the signature in your forum profile if you like.
Sorry, but I have to disagree. There are major differences between 10.8, 10.9, and 10.10.
The list either needs to be fixed, or removed.
Entering bad data is the worst thing you can do.
Thanks Nigel.
The OS list is updated now guys - sorry for taking so long to get to it! If necessary, you may update your post to reflect the proper Operating System version.
Cheers
Model: 21.5-inch, Late 2013
Browser: Firefox 32.0
Operating System: Mac OS X (10.10)
Thanks, Ray! 
Model: MacBook Pro (2.53 GHz Intel Core 2 Duo)
AppleScript: 2.4
Browser: Safari 8.0.6
Operating System: Mac OS X (10.10)
Thanks Ray for the quick response and fix to my post.