First off, this would be sooo much easier to learn in tu just go on youtube and search: "How to fly on Fantage". And tu will get tons of help from hundreds of people, and tu can SEE how they do it.
But tu clicked on this article, so I hope I will please tu and I hope this is helpful. :)

HOW TO FLY

When at downtown, in a shop, at a person's house, where ever, tu can fly. And it's super easy.
First, click on your inventory.
Then press the tab button on your key board a bunch of times.
tu will see this yellow box moving around the screen.

If you're at downtown, tu may not see it.

If you're at someones house, tu will see the box highlight the things at the parte superior, arriba of your inventory, like Hair, Clothes, Boards, so on.
If tu see the box 'selecting' these things, wait until the box disappears, then stop clicking tab, and press Enter, o Return (whichever is on your key board). The inventory should be exited out, and tu will see someone's ID fone.
Exit the fone, click on your inventory again, and then exit out of it.

If you're at someone's house:
tu will see your character on the wall, and prest-o! You're flying! Make sure tu don't touch the floor, o tu will have to do this all again.
ALSO, tu can only fly if about three people o más are there wit you. Because what you're doing with the tab is you're 'clicking' onto people, and entering their ID fone, and that's how tu fly.

DOWNTOWN, o ANY WHERE ELSE:
Click in the sky, and wait a few seconds, and then your character will be there in the sky! Weee!

WANNA KNOW HOW TO 'FALL'?
tu can do this at downtown.
People always tell tu they used "Magic". But it's just because they don't know how they explain, and most would say "go on youtube and find out".
So here's how tu 'fall'.
Simple once you're in the sky, make sure you're not standing above a building, o the pathway to uptown. Then click on the ground, but as close to the bottom of the fantage screen as possible.
Try clicking siguiente to a person's name.
Then once you're reached the floor, use your arrows (on your key board) the go even further down. Make sure tu don't go up to high, o tu will have to re-do!

I HOPE THIS HELPS. :)