At present we have our database server on AWS EC2 instance (using phpmyadmin) and all our applications use ELB. We want to move our database to RDS and I have successfully replicated our master database to RDS (using official documentation, link: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/MySQL.Procedural.Importing.NonRDSRepl.html).
The problem is, we would like to point ELB URL to RDS. I tried searching for the solution and procedure, but couldn't find any.
No, you can't point ELB to RDS.
However, you can you can use HAproxy/Nginx as as Level 4 load balancer/reverse proxy for this purpose. Refer:
https://www.digitalocean.com/community/tutorials/how-to-use-haproxy-to-set-up-mysql-load-balancing--3 http://www.severalnines.com/mysql-load-balancing-haproxy-tutorial