To begin, upload your "MyEBirdData.csv" file:

Note 1: you can request the eBird export from here: https://ebird.org/downloadMyData. You'll then receive an email from eBird to download a zip. Extract this and upload the csv...

Note 2: your data is not uploaded, everything is done locally. Refresh and it's gone.

Note 3: I've only tested with my own dataset, so it could be that if you have many checklists this won't work.