You can also follow the official installation guide here.
Step 1) Get The Angular UI Bootstrap Library Files
via npm:
npm install angular-ui-bootstrap
via bower:
bower install angular-bootstrap
Step 2) Import The Angular UI Bootstrap Module
angular.module('myModule', ['ui.bootstrap']);
Step 3) Use Some Icons!
You can then add an icon anywhere by creating an tag (yes, the "i" is short for icon) and giving it two classes: one that is always just "glyphicon" and one for the specific glyphicon you want to use. Here is an example:
<i class="glyphicon glyphicon-fire"></i>