On you computer

Start->Control Panel->Printers->Add a printer
Add local Printer->Create new port->tcpip->192.168.1.100

Note, add your printer as a local printer although it's network connected.

On you printer

Use HP All-in-One control panel on face of printer to set it's ip address.
Here's the procedure for printer C6280, refer to manual for other models.
 
To view and print the network settings

1. On the control panel of the HP All-in-One, press Setup.

2. Press until Network is highlighted, and then press OK.

The Network Menu appears.

3. Press until View Network Settings is highlighted, and then press OK.

The View Network Settings Menu appears.

4. Do one of the following:

• To display wired network settings, press until Display Wired Summary is

highlighted, and then press OK.

This displays a summary of the wired (Ethernet) network settings.

• To print the network configuration page, press until Print Network

Configuration Page is highlighted, and then press OK.

This prints the network configuration page.