Hello @M-NCPPC ,
Tags aren't an available option for sign up forms at this time. Tags are something that would need to be applied by you outside of the system and imported in, or added from the Contacts page.
For more info on managing tags
For additional info, voting, and voicing of use cases regarding tags and sign up forms, I'd recommend checking out either this Feedback thread about further customization of sign up forms, or this other one specifically about signee-facing tag selection.
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