Hi @Fausto_Carello.72y I’m Juan from Zwift. I appreciate you taking the time to share your query. I understand how important it is for you to have the same username on Zwift or the Zwift forums.
The user name in Forums is usually auto-generated. If you would like to update it, please go to your profile, and then to the gear icon (preferences). Once you get there, you can easily edit your user name by clicking on the pencil icon. Scroll down to “Save Changes” and click on it.
It was my pleasure. If there is anything else We can help you with, please let us know.