Bob, I'm very relaxed thank you for your very helpful suggestions. Yes, I rebooted the Airport device and my Macbook long before i went so far to post a thread here at Apple Support. I don't know why you'd assume I don't remember the changes I made, but yes I do remember all of the network changes I made but they were irrelevant at the point I posted my thread.
I was however able to figure this out on my own. I simply created a new network, and connected the Airport to that network. Then I joined the new WiFi network and searched for the Airport again through the Airport Utility It showed up and I found the Airport Time Capsule and was able to connect and complete my backup and access all of my data > I'm just on a new WiFi Network that I'll have to move the rest of my household too.. but it's fine.
My question was more to the point, if you by mistake press 'Forget this Device' on your home network, how can you 'un-forget' the device and find it again to resume your backups, etc. ALL of the threads I read were to reset to factory settings so I was looking for some more in depth suggestions.. other than of course to restart my computer as you suggested
Thanks though, we are back online.