Workflow to update linked user upon sign-up

I have a data type called TAG and a number of preconfigured TAGS.
I have a sign-up form on the TAG Page. I also have a field called linkeduser on the TAG data object.

Upon a user signing up on the TAG page, I would like to update ‘linkeduser’ field on that specific tag to match the user who had just signed up.

How will this be achieved?

Is this correct? If so, I’ll need to hide the sign-up form to users who are currently logged in to avoid another person over-writing this, right?

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