Hi Shaik,
The taglib class can be found in the portal source. Have a look at the util-taglib/src/com/liferay/taglib/ui/InputEditorTaglib.java class. Depending on what you want to change though, you may need to check the jsp files for this taglib. Those you will find in portal-web/docroot/html/taglib/ui
How you make these changes though will depend on the version you are using. If you are new to Liferay, it might be an idea to let us know which version you are on and what change exactly you are trying to make so that we can give you some guidance.
