Yes — you can edit your application after submitting, as long as the property manager hasn't started reviewing it yet.
How to make changes after submitting
On the "Your Application Is Submitted" confirmation page, find the "Need to make a change?" section
Tap Go Back & Make Changes
Edit any section you need to update
Re-submit your application when you're done
Once review has started
If your application has moved to the "Under Review" step, you can no longer edit it directly. To make changes after that, contact the property manager you're applying through. Their contact info is usually on their website.
Heads up
Going back to make changes pauses the property manager's review until you re-submit. So make your edits and re-submit promptly to avoid delays.