From your SoFi Savings homepage:
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Go to the 'Vaults' section
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Click on the Vault in question
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Select ‘Add New’
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Then select 'Roundups
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Use the toggle to activate Roundups On (blue).
You can also activate Roundups by selecting Autopilot, ‘Add New’ and finally ‘Roundups’ from your SoFi Checking and Savings homepage.