To add a module from awebsite as http://technet.microsoft.com/fr-FR/scriptcenter/dd742419.aspx, you need to follow these steps :
1) Find where are located your modules with "dir env:psmodulepath"
result :
So you know where you have some Powershell Modules and this location will let you place yours in the same path :
In our example I copy a downloaded module into C:\WINDOWS\system32\windowspowershell\v1.0\Modules and you will be able to use all commandlines attached to it.
2) Copy your module in location observed in previous command.
Example, I put my module called NTFSSecurity here : C:\WINDOWS\system32\windowspowershell\v1.0\Modules\NTFSSecurity
3) Import your module in Powershell :
Import-module -Name C:\WINDOWS\system32\windowspowershell\v1.0\Modules\NTFSSecurity -Verbose
4) Now you can test your module with specific command lines. First use this commandline : get-module NTFSSecurity
See result below :
If you need to identify each commandline attached to this module try this command :
(get-module NTFSSecurity ).ExportedCommands
Enjoy now.