What someone's command to do?
The command is
/ tp @a [r = [insert here block number without brackets]]
I hope nothing has changed. But that would have to be the order
(@a you can also replace with @e or @p.)
/ tp @a [r = 4] 12 11 10
(12 11 10 is an example of an x-y-z coordinate - just enter the coordinates you want.)