Information for replacing the headlamp bulbs is covered on page 234 of the Owner's Manual.
If you need an owner's Manual, you can download a free copy (PDF Version) from Ford. Just click the link below.
2000 Ford Focus Owner's Manual
If you are wanting to replace the entire headlamp assembly, There are 4 screws holding the lamp assembly in. This link has pictures and instructions that will get you through the removal process.
Ford Focus HID Headlamp Upgrade Step 2
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