How to connect a818 to internet *

HP DC7900 Intel Core 2 Duo E8400 2 x 3Ghz 1333Mhz FSB PC 2GB RAM 80GB HD
HP Compaq dc7900 Core 2 Duo E8400 3.0 GHz Small Form Factor Microsoft Vista Business pre-installed w/CoA Intel Core 2 Duo E8400 3.0 GHz processor 6 MB L2 cache, 1333 MHz FSB, Intel Virtualization Technology (VT-x), Intel Virtualization Technology for Directed I/O (VT-d), Intel Trusted Execution Technology, Intel 64, Idle States, Enhanced Intel SpeedStep Technology, Thermal Monitoring Technologies, Execute Disable Bit Intel Q45 Express chipset 2 GB of DDR2 RAM (supports up to 8 GB) 80 GB SATA Hard Drive DVD drive Intel Graphics Media Accelerator 4500 VGA and Display Port ADI 4-channel ADI 1884 codec Audio Intel 82567LM Gigabit LAN Motherboard Features: Four (4) DIMM sockets One (1) PCIe x1 slot One (1) PCI slot One (1) PCIe x16 slot Front I/O Ports: Two (2) USB 2.0 ports One (1) Microphone in 3.5 mm jack One (1) Headphone out 3.5 mm jack Rear I/O Ports: Six (6) USB 2.0 ports One (1) 9-pin Serial port One (1) RJ-45 Ethernet jack One (1) 15-pin VGA port One (1) DisplayPort Two (2) PS/2 ports One (1) Audio In 3.5 mm jack One (1) Audio Out 3.5 mm jackFully Working with 28 Days Warranty It has been fully Cleaned inside out, Tested and Windows They also come with Office, Nero, AntivirusSoftware Extra Upgrades Available 17 inch Monitor keyboard and mouse for Extra £40 20 inch HP Monitor keyboard and mouse for Extra £75