Without more information we are left to guess at what would help your situation. In order to process something like this, you’re most likely going to need a stronger, more processed language to work alongside HTML such as PHP, .NET, JavaScript or one of the many other choices.
Your <form>
‘s processing will need to pass to information to YouTube or another third party API which has access and the methods necessary to control who is and who is not subscribed.
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solved Necessary To Subscribe My Youtube Channel [closed]