How to modify a website's source code (Tumblr)

Click on this if you want to add a custom code (or string) to a Wordpress website.

Click on this if you want to add a custom code (or string) to your blog (Blogger/Blogspot).

Click on this if you want to add a custom code (or string) to a Squarespace website.

Click on this if you want to add a custom code (or string) to a Wix website.

Click on this if you want to add a custom code (or string) to a Shopify website.

Click on this if you want to add a custom code (or string) to a Ghost website.

Click on this if you want to add a custom code (or string) to a Drupal website.

Click on this if you want to add a custom code (or string) to a Frontpage website.

Click on this if you want to add a custom code (or string) to a Joomla website.

Click on this if you want to add a custom code (or string) to a Magento website.

Click on this if you want to add a custom code (or string) to a Typo3 website.