The code your link refers to is not a Packasge in the Maple sense, but rather a collection of procedures. You should be able to read it in like this after you saved the code in a file code.mpl:
You can make a true Maple Package out of this code by wrapping it in a module like this:
Code:=module() option package;
export Help,S,...; # sequence of the names of all the procs in the code
(content of the file)
To make this accessible to Maple you first execute the above, which defines Code as a package. You then put it somewhere accessible:
where libname is a list of directories Maple will search for Code.mla.
You do this once and then you can load your package in any worksheet using with:
and it will all be there. Note that in this worksheet, libname also has to include the directory where Code.mla got saved. I do this in my .mapleinit file like this:
whice prepends my own directory to whatever Maple needs, thus my stuff goes first.