Can not connect core to Wifi via Android

I power my core then open Android app but when I Input my Network SSID password
the CONNECT button is disable to touch?

So, How to solve this problem?

Please, Help

Thank you and Best Regards,

Is your Android phone currently connected to the same WiFi network as the should be?
If so, the SSID should be preset in the SSID field already.

I found the reason that because my Wifi is WEP

Thank you