2. and implement that JS code.
1. Can be achieved by editing the dispform.aspx page and adding a Script Editor Web part in the Web part zone (after the default form Web part).
a. Download "spjs-utility.js" from here, and "jquery-1.11.3.min.js" from here.
b. Add both files "jquery-1.11.3.min.js" and "spjs-utility.js" in a document library of your site (like "Style Library" or else).
c. In the Script Editor Web part, reference that JS file with a script tag:
Then, use a code such as:
var linkValue = getFieldValue('URL');
window.location.href = linkValue; // TO BE TESTED: linkValue may contain both the URL and the description (or maybe it's an array?=. Check the value contained in linkValue with the F12 tools, and adapt code accordingly