This assumes you’ve read the Data Shares Introduction.

Your plan must enable data shares. Your role should also include the Change Organization Profile and Manage Apps permissions.

You can then quickly enable the Data Share, by going to the app's dashboard page, then click on the more button.

Once the data share modal opens, select the "Enable Data Share" button.

Once enabled, you can select the data format for which you want to view the URLs. Then use the copy-to-clipboard button to be able to easily share the link in email or IM. 

You can also use the link to download the App’s current data set to your machine in that format to use locally by pasting the URL into a web browser.
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Apps with a data share enabled have a green shared label by the app name on the homepage to help them stand out.
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If you have Apps that make use of repeatable sections for parent-child data relationships, Fulcrum will generate separate URLs for the child record datasets. When you have a data share enabled on one of these Apps, you’ll see URLs that call out the child data at the end of the URL, as you can see in the screenshot above.