see your liferay-portlet.xml
In docroot/WEB-INF/liferay-portlet.xml,



you can also customize config icon  this way:

you can add add the configuration-action-class tag

<liferay-portlet-app>
<portlet>
...
<configuration-action-class>com.sample.strutsliferay.portlet.action.ConfigurationActionImpl</configuration-action-class>
and then write your custoized action:

ConfigurationActionImpl.java