If you are needing to edit your return and you have submitted it yet, you would just log back in and click Review My Return.
If you need to edit it after it has been submitted, you would need to wait until it has been Rejected or Accepted. At that point, you would need to Amend your return. Please see below on how to complete an Amendment:
https://ttlc.intuit.com/replies/3288565
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