Hi Sandrine,

Please follow the below steps to connect your HP Printer with your WiFi.

Step 1: Prepare for installation
Before installing the printer software and connecting to your wireless network, check the requirements, turn on the computer and the router, and set up the printer.

1. To use your printer on a wireless network, you need the following items:
   • A computer connected to your wireless network
   • Internet access: HP recommends broadband Internet access such as cable or DSL for software downloads, using Web Services, and getting printer updates.
2. Make sure the router and computer are turned on, and that the computer is connected to the same wireless network to which you want to connect the printer.
3. Set up the printer, load paper into the input tray, and install the ink cartridges.
4. Turn on the printer and place it close to the computer and within range of the router during the setup procedure.

Step 2: Install the printer software
On the computer you want to print from, start the software installation, and then download and install the HP full feature print driver. It contains the wireless print drivers, as well as HP Printer Assistant software for scanning and other printer management functions.

1. Disconnect any USB cables from the printer.
2. Go to 123.hp.com/dj2600, and then click Download to download and run HP Easy Start.
3. When prompted to select your printer, click My Printer Is Not Shown.A Printer Not Found screen displays.
   Figure : Clicking My Printer Is Not Shown
   
4. Click Continue, and then select Wireless network (if applicable).
   
5. Click Continue, and then follow the on-screen prompts to set up your printer on a wireless network.

I hope this helps.

Regards,
Lokesh