Gallery

My image gallery doesn't seem to be working. This is what I did. I created a Gallery Page on the Top Menu. Then I created a gallery called Alfresco and added a Featured image,which put the alresco image under the heading of Gallery. Great, that's what I want to see. But then I went back to the Alfresco gallery to add the images. I clicked on Add Images and selected Add Gallery. I chose the images that I wanted and clicked Create New Gallery and then clicked Link to Media File and then clicked Insert Gallery. then Update page. When I previewed gallery, nothing is showing my site is www.drcbuilders.com.au what am I doing wrong?