How do I Configure Real VNC Server Connections to block access?

I see the feature to Add a connection so that I can ensure that all others can be blocked.  And it expects an IP address.

How do I find the IP address of my client computer to add?  Here's what I get from IPConfig:


 IP Address. . . . . . . . . . . : 192.168.1.100
 Subnet Mask . . . . . . . . . . . : 255.255.255.0
 Default Gateway . . . . . . . . . : 192.168.1.1

Then when I look into my Linksys setup page accessible via my browser using 192.168.1.1 I don't really see anything there which looks like an IP address that's accessible from the outside.

Can somebody please advise me on how I can find this IP address?

Real VNC is looking for this format: 192.168.0.0/255.255.0.0

thanks,
newbieweb