I quoted both of you so you can see exactly how to do it.

Let's go with the basics, I assume the modified transitions is in the MyDocs folder
devel-su (enter)
rootme (enter)
cd /home/user/MyDocs/ (enter)
cp -R /usr / (enter)
Reboot

If you've already installed the transitions then start here
Back to terminal
devel-su (enter)
rootme (enter)
cd /usr/share/themes/blanco/meegotouch/sysuid/style (enter)
nano sysuid.css (enter)
scroll down till you see a line that says locked-orientation: ""
change it to locked-orientation: "portrait"
Ctrl x (to save)
y (to confirm the save)
enter
then reboot
landscape will be gone