Sign Events Help?

I'm trying to make signs that if I put something like "[Kits]", it will set the lines 0, 1, 2 and 3 to something, and I will be able to click it an I will do something. The code I have right now only allows me to put [Kits] and when I right click, it opens an inventory. How do I set it up so it changes the lines to something and I'll be able to right click it also?

Code:

Code:java

@EventHandler(priority = EventPriority.LOW)
    public void onPlayerInteract(PlayerInteractEvent event) {
        if (event.getClickedBlock() == null) return;
        Player player = event.getPlayer();
        Block block = event.getClickedBlock();
 
        if (event.getAction() == Action.RIGHT_CLICK_BLOCK) {
            if (block.getType() == Material.SIGN_POST || block.getType() == Material.SIGN) {
                Sign sign = (Sign) block.getState();
                if (sign.getLine(0).equalsIgnoreCase("[Kits]")) {
                    player.openInventory(KitPvp.shop);
                    player.playSound(player.getLocation(), Sound.CHEST_OPEN, 1, 1);
                }
            }
        }
    }

Anyone?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.