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Open the Settings app and search for Apps & features.
Alternately, you can just open the Settings app and drill down to Settings > System > Apps & features
Once Apps & features has opened click on the Manage optional features link.
From the Optional features page click on the plus sign symbol next to Add a feature.
This list is in alphabetical order so just scroll down until you find Insider Hub.
Click on Insider Hub and when it expands click on the Install button.
After the installation you will be returned to the main Optional features page and you will see Insider Hub listed as an installed feature.
You can now access Insider Hub through the All Apps list.