Mailbox creation

Hi Ellie Gillespie,

Without details of the issue you're facing, error messages displayed, or unintended results of actions you're completing, the best information that can be shared is the support article Use mailboxes to organize email on your iPhone or iPad which outlines how to create a mailbox on an iPhone as:

"Create custom mailboxes

1. In the Mailboxes list, tap Edit in the upper-right corner, then tap New Mailbox.
2. Give your mailbox a name. If you have more than one email account set up on your device, tap Mailbox Location and choose the account where you want to create a mailbox.
3. Tap Save, then tap Done.

You can find your new mailbox in the Mailboxes list under the account where you created it."

If those steps don't help, supplying additional information on what you see when attempting that process may help future replies provide more relevant suggestions or direction.

Regards.