Newbie Help! How to make a button clickable?

I'm not very good at HTML but need help with an online quiz I am trying to setup on my website. I am trying to make a Submit Button clickable so that it goes to the next page. Here is the HTML code:

<INPUT class=submit type=submit value=Submit!>

 

<form action="nextpage.html" method="GET">
<input class="submit" type="submit" value="Submit!" />
</form>

Code (markup):

Hope that helps!