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That was a typo: he meant WhatsApp but mixed up his messaging apps. I sometimes do that while talking - the names WhatsApp and SnapChat have the same rythmn and are both messaging apps (albeit different in what they do) so I sometimes cross the names.
If you know the number then if you can't just type it in to WhatsApp (I don't have my phone to check at the moment) then surely adding it to your contacts is the quickest solution. If you don't know the number I don't see how you would send a message anyway.
