My very first GIMP Tutorial I'm so happy about it too~ -Cough...- Anyways I hope it works I put it to where even I, the slowest person ever..., can understand it. Hah!
If you still need help there's another tutorial on here: [link]
I will update a better copy so you can see the words better...one day....
To make the black background it's File > New... > When the dialogue box comes up press the arrow that says- "Advanced Options" > "Fill with" (click this.) > "Foreground Color" If you have just opened gimp then it should be black.
To make a border with flames.. Mm.. I'd say just rotate the image and duplicate the layer until it fits around the edges. If you need anymore help- Send me a note.
File > New... > When the dialogue box comes up press the arrow that says- "Advanced Options" > "Fill with" (click this.) > "Foreground Color" If you have just opened gimp then it should be black.
To make a border with flames.. Mm.. I'd say just rotate the image and duplicate the layer until it fits around the edges. If you need anymore help- Send me a note.