I am working through Glide's "Ascension's Atlas Style in GIMP" Tutorial and I have a question (not sure if it has been asked before).

On page 2 of the PDF step 5 asks to fill with a linear gradient and refers to Ascension's original Photoshop tutorial. I need to know how to add the color steps from the Photoshop tutorial in Gimp.

From Ascension:
"Add a layer style of gradient overlay. We’ll use 4 colors with 5 stops as follows:
Color 1 at the 5% position is flat white, color code FFFFFF (RGB 255, 255, 255)
Color 2 at the 35% position is a dark olive green, color code 405018 (RGB 64, 80, 24)
Color 3 at the 60% position is the same dark olive green
Color 4 at the 85% position is a dark flesh, color code DAC094 (RGB 218, 192, 14
Color 5 at the 100% position is a papyrus, color code F0E6BE (RGB 240, 230, 190)."

Thanks for your help in advance