You will create a total of 3 galleries.

The Main gallery for this challenge.

Within the Main gallery you will create the other 2 galleries.
1 - The Challenge, this is where the challenge images will be and it is a good idea to upload them as they come in rather than waiting.
2 - The Exhibition gallery, this is for exhibition images.

Enter the Name for the Main gallery, it cannot have spaces in it, example would be like this Challeng_xx.

Now click the 'New Gallery' button. This will create the gallery and take you to the main edit page of that gallery where you will upload a photo.