I have downloaded Wassapp on PC. Created account and successfully registered, but it said that during registering account on Wassapp I have to enter my mobile number. There is no option in the form of registration to fill. They only need my mailing address, username and password. Then I receive a mail of registration with code. Now the problem is after singing up. How do I use WhatsApp. Either I have to install it separately on my PC or is there any way to install through Wassapp and, if yes, then from where?