Were you supplied with the (36 page) user manual for the N300? My experience of Netgear is that you often only get a small quick set up guide with their products.
The user manual may be downloaded here:
http://www.downloads.netgear.com/fil...2April2014.pdf
Are you connecting using WPS?
Steps seem to be:
1. Look for the router in your wireless networks list. You should see both a 5 GHz and 2.4 GHz presence.
2. Connect computer to router having decided whether you wish to use the 5 GHz or the 2.4 GHz network.
3. Connect extender to router by WPS.
4. Look for the extender in your wireless networks list, then
change the computer connection to the new extender network. The password for which should be the same as for the router.
5. Connect printer to extender by WPS.
Note that data transfer through the extender will be slower than direct connection.