The following is only applicable to mobile devices.  You do not need to do the following for a desktop (continue to the instructions for Desktops).

If this is the first time you are using the weekly sweeps sign up sheet,  you must make sure you have the Google Sheets Application installed on your mobile device (phone or tablet).  On your device under settings verify you have the Google Sheets Application by doing a search.  If not on your device, then click on the following link to install the sheets application depending upon the type of device you will be using.  

Install app on Android devices 

Install app on Ipad or Iphone