Using a My Net N900 as an extender

If I buy an additional My Net N900 as an extender, do you use the yellow port as the uplink or can any port be used on the extender?

Yellow port will be the uplink.

For additional information about using the router as an access point ( extender ) please see the link bellow:

WD My Net User’s Manual

http://www.wdc.com/wdproducts/library/UM/ENG/4779-705072.pdf#page=72