Hello @Marco Rodrigues,
Thank you for reaching out to Atlassian Community!
In order to associate a field with an issue type, please, go to Project settings > Screens.
On this page, click on the link that says “Create Issue Screen” first. It will show the list of the fields already added and then, if the Start date is not there, add it by searching at the bottom of the page.
After that, follow the same steps for the link that says “Edit/View Screen”
You can also add to the screens directly from the custom fields page. Go to Cog icon > Issues > Custom fields > Search for Start date > Click on … > Associate to screens and then, just click on the checkboxes to select them and click on Update.
Hope this helps!
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