Enter https://make.powerapps.com/ in browser and login.
Click on SharePoint (Similar process is used for other data sources too)
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Select the sharepoint account
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Enter the sharepoint Site URL
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You will see the lists on the right side. Select one of the list and click on Connect.
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It will take few seconds to load
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You will see your first screen like below
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Notice by default the name of the App is App
To rename it click on Settings.
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You can change app name as shown below.
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You can either use ctrl+s or click follow below process as shown below to save your app
Click on File
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Click on Save as and hit the Save button in the bottom right corner for the first time.
Save as is used to make the copy of the app after you save it for the first time
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