Rapid spell

Quick Play Spells have a spell speed of 2 which is equal to normal trap card.

You can activate/chain quick play spells from your hand in the battle phase.

You can't activate Quick play spells during the damage step though because only speed of 2-3 can be used.

The speed 2 spells which can be used are only those that gain or lower attack during the battle/damage step.

Lastly, When you set a quick play spell.

The quick play spell than acts like a normal trap card spell speed 2.

You can't activate traps the turn you set them.

For this reason, The quick play spell can't be activated the turn you set it because it mirrors the same properties as a trap in that situation.

quick play spell (any of them) can't be played during the same turn that card was set
so if you want to play them in same turn you must keep it in your hand
sorry for my english