You can enable printer sharing on the computer where the printer is connected, then share the printer so it can be accessed by others on the network. The steps vary depending on which version of Windows the computer is running, so use the help screen. The steps will be listed for you to follow.
On your wireless computer, add the Lexmark printer as a network printer. You will probably need to install the printer drivers, so have the CD handy or download them from Lexmark's website.
Make sure both computers are members of the same workgroup, or the wireless computer won't be able to find the printer on your network. Also, the computer the Lexmark printer is connected to must be on and running for printing over the network.
An easier way to share your printer is by using a USB print server. One example is here
. The server connects to your printer by the USB cable, and by an Ethernet cable to one of the wired ports on your router. Then any computer on the network can use the printer at any time.