Find the Dragon Scale Forge (Immediately to your right upon entering the fortress.) Stay close to its vicinity.
Open your inventory (default hotkey: i) and locate the bright green formula. Right click and click Scribe Skalkaar Dragon Claws.
Open your Knowledge tab (default hotkey: k) and find Skalkaar Dragon Claws in the list. Double click it, and then double click Skalkaar Dragon Claw.
Open your Character tab (default hotkey: c) and click on the fourth tab over, Abilities. Just beneath that, click the label Craft. Move Dragon Scalecraft to an open hotkey (It's useful to create a seperate hotkey bar for the crafting abilities). Then click it to activate it.
You are now able to make the Skalkaar Dragon Claw. Select CREATE when no other resources listed are red.
Jemenoth tells you, 'Good, now use ten bronze bars and six garnet gems, your Dragon Scalecrafting ability, the Dragon Scaleforge just inside, and the Skalkaar Claw formula I have given you to create your first Dragon claw. Once you have crafted it, you can equip it to derive the benefits that it brings.'