How or where do I setup tags?

you+anythinghere@yourdomain.com. Use this as a fast way to segment incoming mail for your own filtering rules without having to create aliases in this control panel.
Where do i set this up?
Sorry to ask such a lame question!

You don’t “set it up” you just use it.

If you are referring to the filtering rules, you need to access Sieve. Roundcube does have a sieve interface that you can use.

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