To compile the Less files, consult the Getting Started section for how to setup your development environment to run the necessary commands. See the example below for a better idea of how it all works. Don't want your columns to simply stack in smaller devices?
Mixins are used in conjunction with the grid variables to generate semantic CSS for individual grid columns. Use Bootstrap's predefined grid classes to align labels and groups of form controls in a horizontal layout by adding .form-horizontal to the form (which doesn't have to be a