When you first deploy the Related Pages module (also called the Child Links module), you will want to make sure you set it up before copying it to other pages. This will ensure they all have the same title and container.
Go into the settings under the pencil icon and under the first tab, give it the name you would like displayed above the links. We typically go with 'Related Pages'.
Then go to 'Page Settings' and select the container you want.
Then click Update at the bottom.