How to add button in Service portal?

[salu]

Hello,

We need to add a button like continue.Earlier we used add it by a macro variables but service portal it won't support.can some suggest an alternate method for it?

And also on click I need a generate a page which shows some information.In normal CMS we did it like UI pages through jelly script.Can someone help me on this.

The below image show what am exactly looking for

Thanks

Saranya

[Michael Kaufman]

Here is an extension on this with a modal window for resolve comments

Service Portal: Resolve Incident Button — ServiceNow Elite

[Koji Yanase]

Do you know how to add a confirmation (OK or Cancel) before updating the state?