Question: where to add event key?

[andy-hbo]

I'm following the deployment instructions:
3. Add a Feature with the key sorting_enabled. This will act as a toggle for our new feature.
4. Add the Event Key item_purchase.

I created a new project, then created a Feature with key sorting_enabled. For step 4, I think there are missing steps in between 3 and 4. Will I need to create an Experiment, create a mapping of the feature to the experiment I just created, and then create the event within that experiment? Is there an easier way? Wanted to get the readme updated if this is correct.