How do I track AdSense clicks on Google Analytics?

link adsense account  to analytics account then you will able track your ad click

1. Then click Admin.
2. Now click AdSense Linking in the property column.
3. On the AdSense Linking page, click + New AdSense Link.
4. Select the AdSense property that you want to link with your Analytics property.
5. Now select the Analytics views and click Enable Link.

First you have to link your account with adsense then you are able to see that

Link ad sense account  to analytics account

First you have to link your account with ad sense
Then click Admin.
Now click Ad Sense Linking in the property column.
On the Ad Sense Linking page, click + New Ad Sense Link.
Select the AdSense property that you want to link with your Analytics property.
Now select the Analytics views and click Enable Link.

 If are on wordpress. you can make use of monsterinsights plugin   that will enable you track AdSense clicks to    Optimize Your Revenue