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I got over this problem in the following manner, it has now been superseded, also apologies as I’m doing this from memory.
Not connected to Router A in any way.
During the setup of Router B, I assigned a pc with a static address of Router B+1, using Router B configuration pages. No DHCP etc, as in the original article.
Then I went to ‘Network Connection’ (Win7 BTW), right clicked my network card and selected properties. I then highlighted, ‘Internet Protocol V4’, selected ‘Properties’.
You then need to click the radio button to move from ‘Obtain an IP address automatically’ to ‘Use the following IP address’. Fill in the boxes with the appropriate numbers, i.e. the ones that relate to Router B. Then back to ‘Obtain an IP address automatically’.
When I wanted to access Router B, I’d change the radio button in ‘IPV4’ properties, ipconfig /release, ipconfig /renew.
I could then access Router B’s config pages through my browser, when I’d finished, change back the radio button, ipconfig release/renew etc.

Takes longer to read than actually do. It worked for me, hopefully it may point someone in the right direction.