No internet connection when connect through wifi

Hello Sir,
I have Router model 3G/4G TL-MR3420,
I want to use it to share internet through WiFi, I can logon on that router to configure as Wifi name, Password and after that, i restart that Router and i tried to access internet through wifi, after that it's said no internet connection even it's know wifi name available.
Can you share me step by step please to configure it to get internet working through wifi?
I will give you more informations if you need.
Regards,

VeasnaYim,
Welcome to Seven Forums!

First off, check to see if your internet indicator light on your router is on. If it is not, then it is the router that needs to be reconfigured. Otherwise, disconnect and reconnect to the router and see if that helps.

Yes, It was on of my Internet indicator light on my router. i had retry huge time to do that, but it's still persist.