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You are looking at draft pre-release documentation for the next release of Flows for APEX. Product features documented here may not be released or may have different behavior to that documented here.
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Preparing your App
Prepare Your Application for Flows for APEX 🆕
Import the plug-ins and application items.
A Flows for APEX app requires a set of plugins and application items. These are now all contained in an APEX Component Group, and can be imported in one simple step.
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Go to Shared Components –> Component Groups and click on Copy from another app (Under Tasks in the Right hand pane).

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Select the Flows for APEX application, find the Flows for APEX Components component group, and click on Next.

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Click Copy Component Group
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You how have all the components required. for your application.
Using the Plugins
See Plugin documentation