Make sure that:
Create your kits using /swk create [name]. Replace the [name] variable with the name of the kit.
All items that are in your inventory then, will be added to the content of the kit. So make sure that you only have the kit items in your inventory.
If you forgot to add items to the kit, use /swk update [name]. Replace the [name] variable with the name of the kit. This will update the kit with your current inventory.
Once you've created the kit and added the items, you can set the (lock) item of the kit. You can set the icon with /swk icon [kit]. The item in your hand will then be set as the kit's icon.
The locked kit icon can be set using /swk lockicon [kit]. The item in your hand will then be set as the locked kit icon of that kit.
These icons will be displayed in the kit select menu when the player doesn't have the kit (locked icon) or has the kit (icon).
Now, let's set the lore of the kit. You can do this by using /swk lore [kit] [loreNumber] [lore]. The [loreNumber] variable must be between 1-16 and represents the line of the lore.
The [lore] variable is a string that support color codes (&).
You can also set the locked item's lore using /swk lore [kit] locked [lore].
Only a few more things to do. Now, set the display name. Use /swk name [kit] [name] for that. Replace the [name] variable with the display name of the kit. This supports color codes (&). This name will be displayed in the kit selection menu.
Now there are some optional thing to do. You can toggle whether a kit needs permission to be selected and you can set the kit position in the kit selection menu.
You can toggle the kit-requires-permission option using /swk perm [kit]. By default, no permission is required.
Set the kit position in the kit selection menu using /swk position [kit] [position].
Now just do /swk enable [kit] to enable the kit.