Thanks for reaching out to us!
Currently there unfortunately isn’t a way to load up color presets.
Ribbet Fly is built on a product called Photopea – it has a manual available, and you can find it here. The interface is the same as Ribbet Fly (but it has ads). You can also find various tutorials on YouTube for it.
If you have any further questions, please let us know.
– Regards, The Ribbet Team