After generating the Push widget sign-up code as described in this thread, log in to the admin panel on your blog.
Click on the Appearance (1), then on the Editor (2)
On the right, you need to find a footer.php file (3). Click on it and edit.
Before “</body>” (4) paste the code generated in the GetPush (5)
Finished. Your sign-up push widget is now visible on your website.
NOTE: Do NOT remove any code from WordPress. You only need to add the GetPush code as indicated above.