First navigate to the Pictures tab on the platform and there switch to the Projects tab:
In there you will find that there are various folders (projects) and sub-folders (sets). Please select a subfolder (set) where you would like to put your image. If the folder doesn't exist yet, please create it, by adding a new set:
Add a new set
Once you selected the set you would like to place it in then press the + Create button and click on Image like so:
Create a new image
This will open up a new image scene (which was added to the folder that you had selected).
