Unable to connect to WeChat

I recently purchased an iPad air 2. Since I done't have a mobile phone, I am trying to use my facebook account to sign up in WeChat with WiFi connection.

In order to sign up, I installed WeChat on my PC (Windows 7) and trying to signup an account with facebook account in WeChat, The Webchat sent the verification code to my email address that is registered as my ID in facebook. I entered the verification code and completed the sign up.

But, after the signup, I am still unable to connect to WeChat on ipad. The error message is "Facebook connect not available. Signup with your mobile phone number."

Does anyone has solution to fix this problem?