Instructions
Identify your outgoing connection from the modem. Most modems have outgoing connection port hubs. Determine the type of ports featured on your modem. This will determine the type of cable and mini-USB adapter you need. Most likely, you have numbered Ethernet outgoing ports.
Acquire a mini-USB adapter compatible with the cable coming from your modem. For example: If your modem uses an Ethernet connection, find a mini-USB-to-Ethernet adapter.
Insert the appropriate cable into your modem's outgoing connection port. If the ports are numbered, use the lowest available number.
Connect your Internet cable to the mini-USB adapter. Your cable should be double-headed, inserting into the mini-USB adapter the same way it connects to the modem.
Insert your mini-USB adapter into PSP mini-USB port. From here your PSP will be connected to the Internet.