I sectioned my hair into 3 starting at the top. In the first section, gather into a pony tail and secure with a small elastic. Move the elastic down the pony tail and make a part just above the elastic and make a hole. Flip the pony tail through the hole and pull it tight.
Next I took a small section of hair from underneath the first topsi and used it to wrap around the elastic to cover it up. Repeat the steps until you have topsied all of your hair. You can leave the last one as a pony tail or twist it into a bun. Both ways will look lovely.