Oh okay, so you want to export it? I'm on my dads mac, and i use fire alpaca, and i'm trying to only get the character out of it, and not the checkered background thing.
File>Save As and then there’s a drop down.
.mdp (FireAlpaca only file that preserves layers)
.psd (Photoshop file read by many drawing programs. Preserves layers)
.png (lossless file type that preserves transparency, please use this!)
.jpg (lossy file type that does not preserve transparency but is smaller than all the others)
.bmp (generally a huge lossless file type. No real reason to use them IMO)
Oh and, FYI, the checkered background means “transparent” so you can overlay it with stuff without a background.