First login to your sumo account by accepting the user invite sent to your email.
Once logged into the platform, you will see a button to Get Install Code
Then you will need to share this code with your webmaster to copy/paste into the <head> section of your HTML. If you use Wordpress, Squarespace, Google Tag Manager, Shopify, Weebly, Tumblr, or Blogger, there are quick install instructions listed there.
Click here for more detailed instructions from Sumo.com