To add links to your Tumblr bio, you'll need to use a simple HTML code. Tumblr doesn't give you any sort of built-in way to add links yourself, so you'll have to copy and paste the code in manually.

Dash is free and teaches users to code HTML, Javascript, and CSS While Dash doesn’t offer the range of programming and computing courses rival Codeacademy does, its design means that users are ...