How to import scripts?

I need to export a model to ogre xml, and i already have a script that does this, but i don’t know how i should import the script so I can start it from blender.

You should at least supply the most basic of info such as what blender version and what operating system ?
The most basic method is top open the script in a text window and run the script.

first, which version of blender do you use ?
2.49 or 2.55 ?
also your skript is for which version?

at this moment there are only one exporter for 2.49 which can export animation + mesh
and another one for 2.55 which doesnt export animation (yet)
and a future one which will support animation but isnt written yet, only when blender beta phase is out

here is how you can import the script in 2.49
http://www.ogre3d.org/tikiwiki/Blender+Exporter&structure=Tools

look at installation part
if you use the 2.55 version then …CTRL ALT U
install new addon and so on

PS: richard was faster than me ^^
but like he said, you should tell us your blender version and your os

operating system: Windows 7 (why does this matter?)
Blender wersion: i don’t know, but i downloaded it abouth 2 weeks ago so i think the latest.

copying and pasting the source code, then running id doesn’t work.