Hi Owen, remember we can't help you with "How do i...?" questions, it's specified in our Support Policy: hellothemes.com/support-policy
As an exception:
1) You will find the line that calls the newsletter icon in: app/design/frontend/default/helloglam/template/newsletter/subscribe.phtml
2) The newsletter-susbcribe block is called in the footer of the theme: app/design/frontend/default/helloglam/template/page/html/footer.phtml You can remove it from there, and if you want it to display just in the homepage, so add the line that calls the block in 1column.phtml file (app/design/frontend/default/helloglam/template/page/1column.phtml) which is the .phtml file for the homepage of helloGlam.
3) find that text in: app/design/frontend/default/helloglam/template/newsletter/subscribe.phtml
PS: If you have a theme issue, please open a Ticket, since we do not give support in the Forum, neither by e-mail. We'll answer your Ticket asap!. Thanks.-