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From your Spinup space create a new "Dedicated MySQL - Serverless" or “Dedicated PostgreSQL - Serverless” resource. Note that these are only available for low-risk spaces at this time.
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Configuration is similar for both MySQL and Postgres and you will notice that currently you don’t get a choice for a specific version but just the latest version that is currently available from AWS Aurora.
Pick the Minimum and Maximum capacity listed as GB of RAM, however, keep in mind that CPU and network capacity also increase proportionately.
You can enable “Auto pause” and enter number of minutes of inactivity before pausing the database.
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Enter username and password, and click “Create database”. It may take about 10 minutes before the database is fully up and running.