If it is the first time you have replaced the batteries, you need to push hard on the line on the back of the remote. It will pop open. You won't break it.
FYI, remote controls that have backlit buttons tend to go through batteries very quickly.
Scared wrote:My remote is about 3 months old and need batteries. That is bad enough, but to add insult to injury, we cannot get the battery cover off. Any suggestions?