You can shorten a URL by using an URL shortener website, which will shrink your URL for free. Popular link shorteners on the internet include Bitly, TinyURL, and Rebrandly. You'll need a premium ...
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.