You first need to activate your number (through the 3 digit activation code), then just login to it. If you need it to login online through your Pc then use Chrome through this WhatsApp Web , or if you can't install Chrome, you must use an Android emulator for your pc desktop as explained here: Whatsapp for DESKTOP
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You first need to activate your number (through the 3 digit activation code), then just login to it. If you need it to login online through your Pc then use Chrome through this WhatsApp Web , or if you can't install Chrome, you must use an Android emulator for your pc desktop as explained here: Whatsapp for DESKTOP