I have added Ratings enabling on a item tracking list however I cannot see how you can actually rate a item. We want the ability when someone is in a list item they can like it (once) and then preferably on the main list we can see how many likes on item has. I can see this in my columns but I cannot obviously see how to put this on the main list. I am using SharePoint online.
Are you interested in using Ratings or Likes? Your question title says Ratings.
I think you can only see your own Rating at present. Ask someone else to help test it. If you give a rating of 5, your colleague gives a rating of 1, it should show an average score of 3 out of two Ratings.
In the pictures below I once set up a demo for myself to see how this works. The Ratings you see are just based on my Ratings.