When using this script, it
needs to be uploaded to your website to get custom colours, otherwise it will just use HabboEmotion's default black and white text. Can't really help you out too well if you don't have a web server setup yet for your layout.
Go into
functions.php and change it to point to the URL where the files are.
Then go into
text.php and find
//stroke color, replace the
0x0, 0x0, 0x0 (which is black) with a RGB colour code for the green you want (which you can generate on
ColorPicker), for example I replaced it with
44, 196, 33, a soft green.
That should do it, that's probably pretty complicated unless there's another script out there that's easier to use.
Example of a green outline modified one:
http://iconbits.com/ffff (Size 7 text is usually best)