How to Reject a record from approval process
If a user has submitted a record for approval but there happens to be something wrong with the record e.g. missed out an important field, entered information incorrectly, pressed submit by mistake, a user can ‘reject/un-assign’ the record, setting it back to ‘in progress’.
To reset/un-assign a record, simply click on the REJECT button.

Enter some comments as to why the record is being rejected.

On save, the record will be back to the ‘in progress’ status and will not have any illuminated icons. This will now allow the user to go back and change any details on the record and re-submit it.