I don't know where you are on the path to success, but this is pretty much how I would approach this:
Page references are to pages in the manual you downloaded.
To configure printer to connect to wireless LAN.
Go to printer's Network Menu (p3.19)
Configure Network = yes
Configure TCP = yes
IP Get Method = DHCP (see page E.9) No need to worry about the network mask.
Gateway = skipped (set by DHCP server)
Appletalk = off
Netware = off
Config Netware = skipped
IPX Frame Type = skipped
Reset Network (reboots the network card, at which it should be assigned an IP address
At this point, print the printer configuration page (from the Information Menu - see page E.6), on which will be the IP address assigned to the printer (likely to be something like 192.168.n.n).
I don't know about your router [1], but when mine assigns an address to a device, it (the address) is then reserved for that device.
I'm assuming that this will apply in your case. If not, the approach needs to be altered, but it's just detail.
Now you know the printer's IP address, you can ping it from your laptop/desktop computer. This will verify that your computer can communicate with the printer over the network.
I don't see anything in this manual about selecting the wireless encryption protocol, so presumably it is auto-sensed at the time the printer boots up.
Anyway, next thing to do is, on your PC, to set up a printer port.
From Control Panel - Hardware and Sound - Devices and Printers
Click on "Add a Printer"
From "What kind of printer do you want to install? dialog box,
Click on "Add a local printer"
From "Choose a printer port" select "Create a new port" and "Standard TCP/IP Port", then click "Next"
Against "Hostname or IP address" enter the IP address of the printer (the port name will be filled in with the same info)
Verify that the check box "Query the printer ..." is selected, then click "Next"
The computer will go off by itself for a while - long enough for you to think the process has failed to complete - before returning with steps to install the printer driver (or to select it if already installed going from memory here as I don't want to install a non-existent printer on my own system).
Assuming that the printer actually is using the correct wireless encryption protocol, you should be in business. This can be verified by printing a test page.
[1] A typical consumer router incorporates a router, an Ethernet hub, wireless network, DHCP server, DNS server along with other services that in larger scenarios may each run on a separate box. This means references to the "router" can be ambiguous.