To connect your **HP DeskJet 2800 series printer to Wi-Fi**, follow these steps:

1. **Prepare the printer for Wi-Fi setup:**
– Turn on the printer.
– On the printer control panel, press and hold the **Cancel** button and the **Wireless** button simultaneously for about 3 seconds until the power light flashes and the wireless (Wi-Fi) light starts blinking. This means the printer is in wireless setup mode[1].

2. **Using the HP Smart app:**
– On your smartphone, tablet, or computer, **download and install the HP Smart app** from the App Store or the HP website if you haven’t already.
– Make sure your device is connected to the Wi-Fi network you want the printer to join.
– Open the HP Smart app, add a new printer by selecting the printer icon or “+” button.
– The app will search for your printer in setup mode; select your HP DeskJet 2800 series printer from the list.
– Follow the on-screen instructions to connect the printer to your Wi-Fi network by selecting your Wi-Fi network and entering the password[1][2][3].

3. **Alternative method (for computers):**
– Download and run the **HP Printer Install Wizard** or use the HP Smart app on your computer.
– Follow prompts to select your Wi-Fi network and enter the password.
– This will connect the printer wirelessly to your Wi-Fi network, enabling printing from your computer[2].

**Notes:**
– The Wi-Fi password is the same one used by your other devices on your home or office network (often found on the back of your router).
– Ensure the printer remains on and stays in setup mode until the connection is finished.
– After setup, the wireless light on the printer should be solid (not blinking), indicating it is connected[1][3].

These instructions apply broadly to the HP DeskJet 2800e and similar models in the 2800 series[1][4].

If you want, I can provide a detailed step-by-step guide or links to official HP resources and videos.