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方法一

卸载重装 简单粗暴以免后患

终端执行命令

/Library/Application Support/Jenkins/Uninstall.command 

或者执行命令

sudo launchctl unload /Library/LaunchDaemons/org.jenkins-ci.plist    
sudo rm !$    
sudo rm -rf /Applications/Jenkins "/Library/Application Support/Jenkins" /Library/Documentation/Jenkins    
sudo rm -rf /Users/Shared/Jenkins    
# if you want to get rid of all the jobs and builds:    
sudo dscl . -delete /Users/jenkins    
# delete the jenkins user and group (if you chose to use them):    
sudo dscl . -delete /Groups/jenkins

或者command + shift+g 进入下面路径 双击 Uninstall.command

/Library/Application\ Support/Jenkins/Uninstall.command 

方法二 也是我使用的方法

进入如下路径

 /Users/Shared/Jenkins/Home/config.xml 

复制一份config.xml 有备无患
再复制第二份用来修改
在config.xml中找到如下代码段

 <useSecurity>true</useSecurity>
  <authorizationStrategy class="hudson.security.FullControlOnceLoggedInAuthorizationStrategy">
    <denyAnonymousReadAccess>true</denyAnonymousReadAccess>
  </authorizationStrategy>
  <securityRealm class="hudson.security.HudsonPrivateSecurityRealm">
    <disableSignup>true</disableSignup>
    <enableCaptcha>false</enableCaptcha>
  </securityRealm>

然后保存替掉/Users/Shared/Jenkins/Home/config.xml

重启jenkins服务
在终端关闭

sudo launchctl unload /Library/LaunchDaemons/org.jenkins-ci.plist

在终端开启

sudo launchctl load /Library/LaunchDaemons/org.jenkins-ci.plist

一开一闭重启完成
用浏览器打开 http://localhost:8080
重新设置安全选项，修改密码或重新注册即可重新使用jenkins。

方法三

https://blog.csdn.net/jianglianye21/article/details/78082445
这个方法我没走通，或许对你有用。