How to add Trusted Identity Provider on existing web application sharepoint 2013

Hello,

I want to add Trusted identity provider on existing web application sharepoint 2013.I created web application claimebased auth and structured it a/c to requirement.Now i allready add Trusted Identity Provider which is availabe when i create new web application,but i want to add this identity provider to existing web application.

Is this possible?

Rajesh Kumar "Changing the Face" can change nothing.But "Facing the Change" can change everything.