Monetize your blog's traffic by embedding HTML advertisements into your sidebar. Tumblr provides you with the option to customize your blog's appearance and theme using the settings found on the Tumblr Customize page. Paste the HTML code for your ad into the Description field to display its content on your blog.

Insert Ads Into Tumblr

Copy your ad's HTML code to your system clipboard. For example, highlight all of the HTML code, right-click and then click "Copy." Open the Tumblr website and log in with your account. Click the "Customize" button on the right sidebar. Right-click into the end of the "Description" field and then click "Paste" to paste your code. Click the "Save" button to save changes. The exact location of your sidebar will vary depending on your blog's current theme.