Lyne,
There is a lot of stuff about Apo scripts at the following website
http://apophysis.wikispaces.com/Apo+Script+Reference+Manual

Once you have found a script you want, highlight the whole script and copy it using Ctrl+C
In Apophysis click on the menu Script, then click on the Edit option.  Then click on the New Script icon and in the window that appears right-click your mouse to paste the script into the editor.   Click on the Save icon to save your script in the Scripts folder - the file will have a .asc extension.   You can now Run the script by pressing the F9 key or by clicking on the Run icon