1You can't.
2Radio buttons are there for a single choice.
3For multiple choices, you need checkboxes.
1<fieldset>
2 <legend>Please select one of the following</legend>
3 <input type="radio" name="action" id="track" value="track" /><label for="track">Track Submission</label><br />
4 <input type="radio" name="action" id="event" value="event" /><label for="event">Events and Artist booking</label><br />
5 <input type="radio" name="action" id="message" value="message" /><label for="message">Message us</label><br />
6</fieldset>
7