Following an update site
This tutorial will explain how to add an update site to your install of ImageJ such that the plugins maintained there will be installed and updated just like core ImageJ plugins.
Start the Updater
First, start the updater:
Add update sites
Click on the Manage update sites button to bring up the site management dialog:
If the update site you want to follow is listed, just click the checkbox next to its name. If it is not listed, you can add Click the Add update site button and fill in the name of your choice for the site and the URL, which would be provided by the plugin's author or distributor.
Note: the list of update sites shown by default is generated from this wiki, which you can view and edit here. Update site maintainers are encouraged to add their update site to this list, as it both helps the community and the developers.
After you have selected your desired update site(s), close the dialog. The list of plugins that will be installed or updated from the chosen sites will now show up:
Choose and download plugins
You can select whether you want to install a particular plugin by clicking in the Status/Action column and changing the option - for example, select Keep as-is to avoid installing a clashing plugin.
Once you are happy with what will be installed, click on the Apply Changes button to download your updates.
Restart ImageJ as instructed to finish the install. Check to see that the plugin was installed:
...and that it works:
...and that's all there is to it.