www.mywifiext.net does not work and router has now WPS button

Seting up new extender and option 1 is to connect with WPS, but my (Virgin Media Superhub) router has no WPS button, so i can't get it to connect. 

Option 2 is to go to www.mywifiext.net which is a dead site. 

I seem to have no options left. Not the first time I've had problems with Netgear set ups.

Any ideas gratefully received.

Many thanks!