How to install plugins for Jenkins?

I wanted to install the plugin for Gradle and was perplexed that there was no download button on this page: https://wiki.jenkins-ci.org/display/JENKINS/Gradle+Plugin

A bit more searching led me to: https://wiki.jenkins-ci.org/display/JENKINS/Plugins#Plugins-Howtoinstallplugins

Start Jenkins on your browser, go to "Manage Jenkins" and you'll see the option for "Plugin manager".

Select which plugins you want, and install them. It'll take a while for it to download and install. As the how-to page says, you can also install the plugins manually.

I chose the following, as there was quite a bit of experimentation I wanted to do with a lot of tools. A pity there wasn't any ready plugin for graph databases:

• Git Client Plugin
• SCM API Plugin   
• Git Plugin   
• Git Server Plugin   
• Git userContent plugin   
• Git Chooser Alternative Plugin   
• ruby-runtime   
• git-notes Plugin   
• Static Code Analysis Plug-ins   
• Task Scanner Plugin   
• Database Plugin   
• PostgreSQL Database Plugin   
• LDAP Email Plugin   
• MSBuild Plugin   
• Cobertura Plugin   
• EasyAnt Plugin   
• GitBucket Plugin   
• SSH Agent Plugin   
• The Continuous Integration Game plugin   
• jQuery Plugin   
• jQuery UI Plugin   
• Terminal Plugin   
• ClearCase Plugin   
• ClearCase Release Plugin   
• Gitlab Merge Request Builder Plugin   
• Gitlab Hook Plugin   
• JUnit Attachments Plugin   
• xUnit Plugin   
• JSUnit plugin   
• GitHub API Plugin   
• AnsiColor Plugin   
• JSGames Plugin   
• Mercurial Plugin   
• Git Parameter Plugin   
• Github OAuth Plugin   
• Build Monitor Plugin   
• CodeCover Plugin   
• NUnit Plugin   
• ClearCase UCM Plugin   
• jQuery UI Plugin   
• Valgrind Plugin   
• MySQL Database Plugin   
• Eclipse Update Site Plugin   
• jQuery Plugin   
• Parameterized Trigger Plugin   
• Build Pipeline Plugin   
• HTML5 Notifier Plugin   
• Gitorious Plugin   
• Git Plugin   
• Trac Plugin   
• ClearCase UCM Baseline Plugin   
• Python Plugin   
• Checkstyle Plugin   
• Gradle Plugin   
• JDK Parameter Plugin   
• cmakebuilder Plugin   
• ClearCase Plugin   
• Active Directory plugin   
• Signal killer   
• MySQL Authentication Plugin   
• Metadata plugin   
• Git Client Plugin   
• Git Server Plugin 
•  Parallel Test Executor Plugin

Did you notice that there's a The Continuous Integration Game plugin? I felt it was pretty cool of them to have brought in Gamification into CI.