If you have misidentified a species in a sighting you have logged, then it is very simple to edit the species.
Steps to edit the species in a single sighting post
Open your profile in the Birda app
Tap on the 'Posts' tab
Find the sighting you want to edit and tap on it to open the detailed sighting screen
Tap on the ... icon in the top right of the sighting and tap edit
Scroll down to the sighting heading and tap on the species next to the bird icon
Select the new, correct species from the list
Tap the < icon in the top left to save your changes
Steps to edit the species in a session post
Open your profile in the Birda app
Tap on the 'Posts' tab
Find the session containing the sighting you want to edit and tap on it to open the detailed sighting screen
Tap on the blue 'View Sightings' button below the map
Tap on the sightings tab at the top of the screen to toggle to the list of sightings in the session
Find the sighting whose species you want to edit and tap on it
Tap on the ... icon in the top right of the sighting and tap edit
Scroll down to the sighting heading and tap on the species next to the bird icon
Select the new, correct species from the list
Tap the < icon in the top left to save your changes