Even after your extender may connect to AP by the help of the WPS button, you might face some issues connecting the Mywifiext extender manually. Though Netgear has a default web page address, that is, Mywifiext.net, for the setup of Netgear wifi extender settings, you might not be able to see any page for setup but it might show a website with a normal page or shows an error on the page. This error comes when you are not properly connected to the network or your wifi extender has no connection with your main network.
http://www.mywifi-ext.net/