Once you install this addon, it will be active.

The addon Clear Cache on Admin Login has a single functionality: clearing the cache on admin login.

When you install this addon, this functionality will be active. When you uninstall this addon, this functionality will be inactive. Hence no setting page for this addon.

Works on Super-User logins

When this addon is active, the action that Super-User logins will trigger clearing the cache. Nothing happens when  other users login.

Log out and Log in Again

This addon clears the cache when a Super-User logins. After installing this addon, nothing happens, until you log out and log in again.