The Gallery Manager will list all of the Galleries created on your site:
Click the + Add Gallery button above the Gallery list to create a new Gallery.
You must then enter the name of the Gallery you wish to add, and select whether the titles of each image in the gallery will be displayed. Once these fields have been entered click on the Add Gallery button and the Gallery will be created with your selected options.
Note: If 'Display Image Title' is unticked, image titles can still be viewed by hovering your mouse over the currently shown image.