registerEvent problem

Hi Guys, I'm a 13 year old kid and I'm trying to learn Java to program plugins for minecraft. I want to make a mod that when i put a certain title on a sign; it will change the text to what i want. Unforntunatley i have got one error. Could some one please help me on what to do. The problem is the " pm.registerEvent... ".
It says

"The method registerEvent(Event.Type, Listener, Event.Priority, Plugin) in the type PluginManager is not applicable for the arguments (Event.Type, shlistener, Event.Priority, shmain)"

It says i should change it to this:

registerEvent(Type, Listener, EventExecutor, Priority, Plugin).

Please help. Here is my code for the main file.

Code:

package signhire;

import java.util.logging.Logger;

import org.bukkit.event.Event;
import org.bukkit.event.Event.Priority;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;

public class shmain extends JavaPlugin {
    Logger log = Logger.getLogger("Minecraft");
    private final shlistener plistener = new shlistener();

    @Override
    public void onDisable() {
        log.info("[SIGNHIRE]: hsa been disabled");

    }

    @Override
    public void onEnable() {
        PluginManager pm = getServer().getPluginManager();
        pm.registerEvent(Event.Type.SIGN_CHANGE, plistener, Priority.Normal, this);
        log.info("[SIGNHIRE]: hsa been enabled");

    }

}

Tis is the code for my listener.

Code:

package signhire;

import org.bukkit.entity.Player;
import org.bukkit.event.block.SignChangeEvent;
import org.bukkit.event.player.PlayerListener;

public class shlistener extends PlayerListener {

    public void onSignChange (SignChangeEvent event){
        Player p = event.getPlayer();
        if (event.getLine(1).equalsIgnoreCase("Room 1") || event.getLine(1).equalsIgnoreCase("Room 2")
                ||event.getLine(1).equalsIgnoreCase("Room 3")||event.getLine(1).equalsIgnoreCase("Room 4")
                ||event.getLine(1).equalsIgnoreCase("Room 5")||event.getLine(1).equalsIgnoreCase("Room 6")
                ||event.getLine(1).equalsIgnoreCase("Room 7")){

            event.setLine(2, "&4"+p.getDisplayName());
            event.setLine(4, "Rented");

        }
    }

}

Thanks everyone

 

you want a BlockListener not a PlayerListener

 

Thank-you so much