Search and install the plugin using the Extension Manager.

Alternatively, refer to Plugins on how to install plugins manually:

• Download “Skype plugin” and unzip file locally
• Transfer to server holding Dokuwiki
  • Copy subfolder “skype” to: ..your..dokuwiki…/lib/plugins

{{skype>username}}
{{skype>username,function}}

{{skype>username}}
{{skype>username,call}}
{{skype>username,chat}}
{{skype>username,dropdown}}

You can see the official Skype button wizard here: Official Skype Button Wizard

The Plugin can be seen in action here

Then you need to change your privacy settings in Skype: Options → Privacy → Allow Net Status

• 2011-02-20
  • Initial release
• 2012-06-14
  • Added function in command, to give each button a different function
• 2012-10-22
  • Moved Repo to Github
• 2014-06-16
  • Use new Skype button, works now with Microsoft accounts

See GitHub