I want to remove VPS Instance in AWS and it's RDS.How to remove the both services in my account.
Your question is confusing because the title mentions VPS, while your question mentions VPC and RDS. So, here's some definitions:
If you wish to remove an Amazon RDS instance, go to the RDS management console, select the instance, then in the Instance Actions menu select Delete.
If you wish to remove an Amazon EC2 instance, go to the EC2 management console, select the instance, then go to the Actions menu and select Instance State -> Terminate.
I do not recommend that you delete your VPC unless you created it yourself.