Base came with no instructions, but I figured it out.  Loading the four separate sections with sand was not an easy job.  The screw top opening needs to be bigger to allow the sand to flow into these sections easier.  Be patient it will take awhile to get the sand to fill the base sections.  Had to make my own funnel and system to fill base sections.  You will need to buy 4 x 50lb bags of sand to fill the four sections of the base.  You will have a quarter of a bag leftover after filling the sections. Lock the sections together with supplied hardware and your umbrella can be opened fully without fear of tipping over.