The Chimplr integration allows you to add a signup button to your Tumblr pages, right next to your other Tumblr controls. When a potential subscriber clicks on your "newsletter" button, it will trigger a popup window with a mini-signup form. You can find out more about Chimplr here or from the blog post.
Get your Tumblr Newsletter Button
- Go to Account > API Key & Authorized Apps and copy your API Key.

- Head over to Chimplr and click the Get Started button.

- In the empty field under Enter Your MailChimp API Key paste in the key.

- Select the list that you'd like to use from the dropdown menu.

- Chimplr has now generated the code for your button. Copy the code and head over to your Tumblr Dashboard.

- Log in to Tumblr, if you haven't already.
- In your Tumblr dashboard, go to Preferences and click on the Customize your blog button.

- Paste your button code in the Description section.

- When finished click the Save button.

- Now, when someone views your Tumblr page, they will see the Newsletter button with the other Tumblr controls.
