Bob,
If you provide more about what your setup is currently like, I can help you better. Also, if you do a 'show run nat' that would let me know what you currently have. Otherwise, let me try to guess.
In 8.3 and 8.4 code the NAT syntax looks completely different. So if your reading a book that was released with reference to earlier OS versions, then it's not going to get you anywhere.
Online documentation can be helpful, just find 8.3 and 8.4 stuff like the 8.4 configuration guide or the 8.3 migration guide.
Anyway, enough blabber, lets get to the commands
object network LAN
subnet 1923.168.99.0 255.255.255.0
nat (inside,outside) dynamic interface
That should do it.
If you want to go outside, then you need a NAT statement. So, in 8.3 and 8.4 it looks like the following:
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