Click on the New + button, then click on PostgreSQL
Fill out the Name field, which will be used to label the database within Render. Fill out the Database and User fields, which should be the same as your development setup - ask a volunteer if you are unsure. Leave the remaining 3 input fields as is with the default values
At the bottom of the form, the Free plan should be selected by default. Click Create Database button
Render will take a few minutes to create your database
After a few minutes your Database should be active
Scroll down to Connections tab, where you will find Environment Variables for connecting to your database. The Internal & External Database URLs will likely be the most useful for you
The Connect button could be useful for quick Environment Variable reference