Start off like you would for the Frontflip and then perform a roundoff. Raise your arms and block into the trick, the same way as you would for a normal Frontflip. Even before you takeoff, focus on one spot on the ground. Jump and push all the way through your toes.
Try to lean a little bit into the flip. Not to the point where you would dive into it but a slight lean forward will make the flipping rotation shorter and easier to land.
As soon as you leave the floor drive your legs up and focus hard on driving both feet into the spot on the ground. It’s ok to swing them slightly sideways first instead of completely over your head. It will make the distance your feet need to travel less and easier to come around faster.