Using If Statement to format a bookmark (complete newbie)

Hi

I'm very new to VBA in general and have been excited to get my first userform up and running in word.
What I'm trying to do now is tweak it a little but so that if a field (cboSTATE) is left blank then another field (BkSub) becomes bold.

I've come up with the below from reading the text book I have, but it's not working as it has invalid use of property..my code is probably way off...but

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In case my above explanation made no sense
An example of what I mean is - with all field filled out the form would output an address like
Joe Blog
123 Fake Street
Suburbia
State

but if the state wasn't filled in I'd like it to return

Joe Blog
123 Fake Street
Suburbia

Thanks so much in advance I feel silly asking but as I said I'm a complete rookie and I've been wrestling this issue over the weekend to no avail.
Cheers
KG