All plugins need to be unpacked and uploaded to /httpdocs/lib/plugins. After uploading, go to the admin section → Manage plugins, and enable them.
Tag plugin
Creole plugin
Cloud plugin
Box plugin
Editor plugin
Discussion plugin
Captcha plugin
Am I still using these plugins or are they leftovers:
Code plugin
Dir plugin
Orphanswanted plugin
Display Setting
Authentication Settings
Editing Settings
Link Settings
Media Settings
JPG compression quality (0-100): 100
Advanced Settings
Creole Plugin Settings
Tag Plugin Settings
Discussion