Whenever you share your pods with links, the links start out with your subdomain which is your company name. For example, lunio.trumpet.app, or generalmerch.trumpet.app.
Follow these steps below if you want to change your subdomain.
From your Home page, go to Settings on the left side, and click on Brand.
Change the Company Name. Hit Save Changes.
Go to https://trumpet.app/.
Check if your subdomain has updated successfully.
The new subdomain will only apply when you use the Copy Link functionality after the change. (e.g. sharing newly-created pods, resharing old pods)
The pod links that have been previously sent out to your clients before the change will still have the old subdomain when they open the Pod, unless you reshare the pod after the company name has been updated, and use the Copy Link functionality again to send the new link to your clients.