The sign for "postpone" holds two "F"-hands out in front of you and then moves one or both forward in an up, forward, and down again arc.
POSTPONE:
Animation "POSTPONE" (version 1)
There is a version in which both hands move. This variation means same as the version in which only one hand moves.
Postpone (version 2)
Animation "POSTPONE" (version 2)
Note:
Don't worry about which version to do ("one-handed movement" vs "both hands moving"). I've interviewed quite a number of people and there simply isn't a consensus in the community as to any meaningful differences between the two versions.
Notes: