One of the great things about Script-Fu is that you can share your
script with all your GIMP friends. There are many scripts that come with
GIMP by default, but there are also vast quantities of scripts that are
available for download all around the Internet.
If you have downloaded a script, copy or move it to your
scripts directory. It can be found in the Preferences:
Do a refresh by using
from the toolbox.
The script will now appear in one of your menus.
If you don't find it, look for it under the root file menu
filters. If it doesn't appear at all, something was wrong with
the script (e.g. it contains syntax errors).