First step:
Make a trigger: (3options in one trigger)
REGION>> Move Region 'A' at player-initiator (let's call it R)
REGION>>Move Region 'A' at player-initiator's cursor (let's call it C)
Make another trigger:
REGION>>Teleport all players from region 'A' to region 'B' (so from region R to region C)
Second:
Make two regions,but keep attention,the two regions must be the size of the player
Region R as we call it must be:
Activation on:
TRIGGER (without button) <<so USE key cant be visible
Now put a timer in for the first trigger with two options so it will be launched at the start.
And finish, all you gotta do is aim at the place you wanna teleport and press E.