Hello, After buying and installing i get no wlan/wifi connection. I do have internet by ethernet, the laptops and ipad sees the wlan/wifi but get no connection? Resetting re-installing manualy or with

Hello, Just got my new TL-WDR4300 router. Set it up last night with the latest firmware. I can connect to Internet using a wired cable. However, I can't connect to Internet via wifi. I already tried 2