Minecraft Server Donation

I have a minecraft server run by MCprohosting and have Enjin donation plugin linked with my server and set up. I have essentials kits but can't figure out how to make a single person have access to a kit. I only know the code to give everyone access to a kit or have it unable for anyone to use. I wish to be able to make pvpkits and rank kits with several pieces or armor and weapons along with food that is ONLY accessible to people who have purched the kit in the shop. I don't quite understand permissions yet. This is the best I can explain what I want sorry if it is to vague, any help would be great though.