If you are forgot you router username or passwords then you need to reset it. Reset is not a very difficult task. you can do easily it without any help. in this blog I will tell you if you forgot you ASUS router password or username then how to reset it.
WPS button give you benefit that you no need to password for use internet. in today almost all router extender provide the WPS button But still some Netgear router extender have, who not come with WPS button like Netgear n300. Find the WPS button in extender not a difficult task.
if your router outdate and not provide a full network coverage then Wi-Fi repeater is your problem solution. you need to purchase a new Wi-Fi repeater.