I've already played a bit BR or CTF online, and we have this weapon too in MasterBedroom from Kamek.

I control the basic use, ie left click you throw the ammo and right click you translocate. Nice, but i'm pretty slow to do that

I've seen lots of players translocate very quickly, and go from one side of the map to the other side whereas i was trying (withtout success, they are too fast!) to shot them. (for exemple in FaceClassic, a man who goes across the map in the sky, very quickly, without touch the ground ).

How do you do this? Is there a key tip?

Ken, some servers has other types of translocators, modified with fast and hard shooting discs (faster than falling). It is easyer to stay high and get even higher and higher.

yup and whilst in the air and you right-cick, click left-right again quickly to teleport again... also a thing many players don't know: press q after throwing the disc and your camera switches to the point-of-view of the disc! so you will perfectly see where you land, even around corners and above hills and stuff and can time your translocation better (but remember to move a bit while viewing from the disc otherwise you are a standing and therefore easy target)

Also pressing left mouse button prior to releasing right mouse button; while just translocated; will bring up your previous weapon.