To install Simple Grids & Tables, unzip the zip file and place the
system/user/addons/simple_gridsfolder from the zip file into your
/system/user/addonsfolder, and the
themes/user/simple_gridsfolder into your
themes/userfolder. Login to the Control Panel and go to Developer > Add-ons and install Simple Grids & Tables. Once installed you will see a Simple Grid and Simple Table fieldtype available when creating a new custom field.