Hi Yoann,
"Forms" in Jira can mean a few things.
If you're trying to edit the fields on a Jira issue screen (the one for creating/viewing issues), you can manage those in Project settings > Screens. You can add, remove, and rearrange fields there. For more guidance: Configure Issue Screens
If it's a JSM request form (the one that appear on a service desk portal) you can do this in Project Settings > Request Types. More guidance: Setting Up Request Types
ProForma forms are handled differently, here's their docs: Building Forms in ProForma
Hope this helps! If none of these quite match what you're looking for, tell us more about the form you're trying to edit – a screenshot would be especially helpful.
Seon
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