Go to your Account Settings and click Edit Appearance. Then select Edit Theme.
Underneath Custom Theme, click Edit HTML.
Copy and Paste Script
Paste the POWr script into the HTML file between the Head tags. Update, then save.
New Text Post
Back inside the Tumblr editor, embed a new Text Element.
Copy and Paste Shortcode
Paste the POWr shortcode into the text post, then save Expand the post to see your new Graph plugin. You can edit POWr Graph by clicking the POWr Settings Icon in the corner.
To edit your Graph on Tumblr:
Visit your live Tumblr web page and select the gear icon in the upper right corner of your Graph Plugin.