how to use a macro in a form

[nmr5316]

I want to display output differently according to the value of radio button selected how do i do it.....

this is the macro i am trying to make
[foobar(1)]
args = foo
definition = "foo = $foo$"

original code

TimeLine

index=$username$ $url$ | foobar($username$)

 <fieldset>

<input type="radio" token="username">
        <choice value="abc">ABC</choice>
        <choice value="def">DEF</choice>

    </input>

    <input type="text" token="url" >
          <label>Enter URL:</label>
    </input>
<input type="time" />

</fieldset>

[woodcock]

You do it the same way as on the search bar, like this:

index=$username$ $url$ | `foobar($username$)`

You forgot to use the grave character to surround the macro call.