You just have to open WasaWeb and scan the other account's QR code and now you are done to use the dual chat feature with this web cloning app.
Whatscan for WA Web allows you to open two accounts on the same device or the same account on multiple devices simply by scanning the WA web QR code.
• Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase.
• Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period.
1) Open WA web scanning app where you get the QR code.