Hey Rachel!
There are a couple of possibilities that you have for putting a form in your header. Of course, if your theme allows for you to add a widget to your header, that’s definitely easiest. Although, to be frank, there aren’t going to be many themes that allow you to do that, directly.
If you can’t add a widget to the header area, your best bet is going to be to use either the MailChimp embedded form or shortcode and embed that somewhere in your header’s PHP, unfortunately. To access that particular area, you’ll want to go to “Appearance” -> “Editor” -> “Header.php”. From there, you can make changes to the code. However, before you do that, make sure that you’re familiar with what you’re editing and can access the site from FTP if need be. (I’m talking from experience here..haha)
You’ll want to bring in the <?php mailchimpSF_signup_form(); ?> shortcode and add it where you’d like in the header. Additionally, you could also copy and paste the embedded form in that header, as well. For information on how to grab that code, check out this link from our Knowledge Base:
How can I add my signup form on my website?: http://eepurl.com/gOGN
Unfortunately, we can’t really tell you exactly where to add that shortcode or embedded form, as that’s going to depend on which theme you’re using and where you want to add it. However, with a little trial and error, you should be able to get things looking good!
If we can help with anything else, give us a shout.
Cheers.
