Mobile OTP function enabling

I have recently bought a extension for mobile otp, which had created its registration form where the mobile OTP function is working. please see the screenshot below.

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Now apart from this I have 2 other forms for registering, which doesn’t have this Mobile OTP verifying function. Please check the screenshot below

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So I want to enable, Mobile OTP functionality in these 2 registration forms as well, so how can I do this. Please if anyone can help me out.