How do I add a trash button to my email screen

Hi there Paula330,

Thank you for posting to Apple Support Communities.

We understand you'd like to add a trash button for email. Is that correct? We're happy to help.

Mail app in iOS is not customizable in this way. To delete an email:

• "Swipe left quickly over a single email.
• Touch and hold an email from your Inbox, then tap Trash Message from the menu.
• Tap the Archive button  or the Trash button  from within an email."

Delete emails on your iPhone or iPad - Apple Support

If you'd like to leave Apple feedback about this expected behavior, you can do so here: Product Feedback

Take care.