When you first turn on your wireless printer, the printer needs to be connected to your home WiFi network and you will need to use the 'settings' option on your printer menu to enter your WiFi password (as shown on the back of your router).
Once your printer is visible to your WiFi (it is allocated an address on your home network), your computer will also be able to 'see' it. You will need to go into your computer settings to 'add devices - printer' and select your wireless printer. Once you've done that, whenever you want to print anything using your computer, your printer will be seen to be available (make sure you have turned your printer on first).