Update Response Content Type Schema

You can add a schema to the content type by clicking the red link "Add schema" at the bottom of the content type. Or click Change schema link from the local toolbar.

You can either select an existing schema:

Or create a new schema on the fly and use it in this content type. You can create an inline schema by letting the name field blank.

If you give the schema being created a name, it'll be also automatically added to the global components/schemas. It's then not an inline schema but referred to, by the content type.