Unfortunately, domains cannot be changed once registered.
What you can do instead
1. Email authors@tertulia.com to request cancellation of the current domain
2. We’ll disconnect it and cancel the subscription to prevent future charges
3. Choose and purchase a new domain for $15/year under Settings → Domains
All domain purchases are non-refundable due to registrar policies.
I misspelled my domain or chose the wrong one. Can I change it?
What to do if you made a mistake when registering a domain.