Missing Menu Options on Modem Web Browser Login

> [...] The portfowarding tutorials I've read online all use router
> logons with more options in their web browsers, and I am having great
> difficulty port fowarding without these options. Now, my family uses the
> CM600, [...]

   The CM600 is a cable modem.  Port forwarding is a router function,
not a modem function.

> [...] but we also use several Apple-brand wifi devices such as the
> Airport Express. [...]

   That's a router, and that's where you'd need to configure port
forwarding.  (If "such as" means that you have multiple routers, then
you can expect some problems with port forwarding.)

> [...] I've included screencaps of the modem menus as they are now.

   In-line images in these forums must wait for moderator approval, so I
can't see yours yet.  But if they relate to the CM600, then they're
likely irrelevant.