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Once you have extracted and located the image you wish to install, use your preferred image writer to write the image to your Micro SD card. Here's an example of the process you may follow to use the W32DiskImager:

Run W32DiskImager.exe.
Select the desired MeeGo Handset Image.
Select the drive letter for your Micro SDHC card.
Click the "Write" button to start writing the MeeGo Handset Image to the Micro SDHC card.
Booting MeeGo Handset Image
To boot the image on Nokia N900, you need to get the flasher application from http://tablets-dev.nokia.com/maemo-dev-env-downloads.php. In the page, there are multiple different binaries for different Operating Systems (OS). Get the binary suitable for your own OS.

After downloading the suitable binaries, install/unpackage the package.

With the flasher, the kernel is loaded to the device, which means that the original Maemo kernel is returned when the device is powered off. Here are the steps to load the MeeGo kernel to the N900 device.

Remove the back cover and the battery from the device.
Insert the microsd memory card into the device.
Insert the battery into the device, but do not power on the N900 device.
Place back cover onto the device. If not present, the device will not detect the Micro SDHC card properly.
Start the flasher with the following command:
Linux:

$ sudo flasher-3.5 -l -k meego-handset-armv7l-n900-*-vmlinuz-*-n900 -b

Windows:

$ flasher-3.5.exe -l -k meego-handset-armv7l-n900-*-vmlinuz-*-n900 -b

When the flasher is started, you should see following message:
flasher v2.5.2 (Oct 21 2009)
Suitable USB device not found, waiting.
If you see the message shown in 6, then connect the N900 with USB cable to your PC and the flash should start automatically.
Message similar to
Found device RX-51, hardware revision 1801
NOLO version 1.4.14
Version of 'sw-release':
Sending kernel image (1564 kB)...
100% (1564 of 1564 kB, avg. 16638 kB/s)
Flashing kernel... done.

should be shown. After this process, the device should boot to the MeeGo Handset UX.