I have access to my Asus router , however all I see are IP addresses, How do I find out the users name that is actually using my router? I just have that feeling others are using It.
You can't see user names far as I know. Maybe if you got a network analyzer like Wireshark but even then, you'd need to be really experienced to find anything. The best you can do is compare IP addresses of your devices and only allow your devices to connect to your router. You can try not broadcasting the SSID, while also changing the SSID (since anyone who might have it now, will not be able to just keep the settings). Also changing the password now and often will deter people from using it.
How to Disable SSID Broadcast on Your Wireless Router
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