There is no meego1.2 till april, You can only use meego1.1

IMPORTANT- You should have atleast 2gb mmc,extra-devel should be enable in your apps manager and Maemo-Flasher.

First go to: http://tablets-dev.nokia.com/meego-codedrop.php

1.Download the latest meego.img and meego kernel.(From above site)
2.Uncompress raw image (Using bzip or 7zip etc)
3.Download the Win32DiskImager.exe program (https://launchpad.net/win32-image-writer/+download)
4.Run the win32DiskImager,exe
5.select the meego image
6.Select your 2gb mmc directory
7.Click write button (It will send meego image in your mmc)

Now at last,
If you need to boot to meego,You have to use Maemo Flasher every time.
Open your meego flasher,Type

flasher-3.5 -l -k <kernel> -b (You need to change kernel to your meego kernel)
Then,It will boot meego.
Press thanks button lol