Edit Appearance Edit Theme
In your Tumblr dashboard, open your Account Settings. Select Edit Appearance and click Edit Theme.
Go to Edit HTML.
Paste the Script
Paste this script into the Tumblr HTML file. It's always best to paste it between the Head tags. Once you add the script, click Update and save.
Create a new Text post in the Tumblr dashboard.
Paste this shortcode into the post. Expand the post, and you'll see your new Star Rating plugin. You can edit POWr Star Rating by clicking the POWr Settings Icon in the corner.
Start to edit your Star Rating Plugin:
Visit the live Tumblr web page and select the gear icon in the top right corner of the Star Rating Plugin.