Open the Amazon RDS console.
Choose the rdspg-fcj-labs instance and click Modify.
On the Modify DB Instance page - choose the appropriate DB instance class or DB instance size:. Then click Continue
On Summary of modifications notice the changed istance type and choose Apply immediately to apply the changes and click on Modify DB instance.
The instance will start the DB instance class upgrade process, that could take 10-15 minutes, after which you should see in the RDS Console the updated instance class:
Alternatively you can scale up the instance using the AWS CLI as shown below:
The following command modifies the instance class of the instance.
AWSREGION=`aws configure get region`
aws rds modify-db-instance \
--db-instance-identifier rds-pg-labs \
--db-instance-class db.t3.large \
--apply-immediately \
--region $AWSREGION