1. I'm not sure. In order to communicate over a wireless channel, the nodes at each end must be using the same channel (e.g. 1, 6, 11), communication standard (e.g. 802.11g), and security scheme, if any (e.g. WEP, WPA, WP2, none).
Log into the router configuration pages to verify the current configuration of its wireless access point: Service Set Identifier (SSID), security scheme, and passphrase. The printer needs to match these. If printer doesn't support the current security scheme, you'd have to modify the router's to one that it does support. All wireless computers that will access the wireless printer through the (wireless?) router need to be using the same wireless configuration.
Try to provide:
a. Make, Model Number, (and Version, if any) of wireless printer (probably on the back)
b. Make, Model Number, (and Version, if any) of wireless router (probably on bottom).
Perhaps someone can pull the documentation off the internet to make sense of what they are asking for.
2. Not sure if it matters, but what operating system and service pack level is the computer you will be "test" printing from? It must provide or you will have to install a compatible print driver for that printer. For example, Windows XP Home Edition SP3.