You havetwo options to prepare the dry Caribbean jerk seasoning/rub.
For more Jerk seasoning flavor : use whole spices, toast them on a dry pan until you can smell the spices, let cool and then crush to a fine powder in the mortar or grind with an electric grinder. Mix all the spices together.
For a quick 5-minute Jerk Seasoning: use ready-made spices in powdered form and mix all the ingredients together.