To add a gallery to any content area enter LiveEdit mode for the page you would like to add the gallery to.
1. Click and drag the gallery icon from the Blocks Bar to the content area you would like the gallery to sit in.
2. The Edit galley dialog window will open where you can choose which gallery template to use with that gallery and you can also set which gallery to use. The "Source" option can just stay on static.
3. Once you have chosen the template and gallery click apply and the gallery will be added to the page.