go to the same link...where it says 24 awg...change it to 26 awg... you can change the wire type (not recommended), wire size (awg), inner diameter (2.5) higher or lower depending on what you have to wrap around in US or metric, leg length (changes resistance a little, not important unless you have long legs...the wire from the coil to the screws), and target resistance (set on .5 ohms, build to whatever but I'd suggest at least 4 wraps for flavor and vapor production minimum).
After changing a number somewhere, click on an open spot and the calculator should update if it doesn't change immediately.