Go to Account Settings Edit Appearance Edit Theme.
Click on the Edit HTML link underneath Custom Theme.
Paste POWr Script
Paste this exact POWr script into your HTML file, in between the Head tags. Then click on Update, and save.
Create New Text Post
Go back to the Tumblr dashboard and add a new Text post.
Paste the Shortcode
Paste the shortcode into the post. Then save. If you expand the post, you will see your new POWr Job Board. Click the POWr Settings Icon to set up POWr Job Board.
Begin customizing the following Job Board Plugin right in your Tumblr site:
Go to your live Tumblr website and select the gear icon in the top right corner of the Job Board Plugin.