Sign in to your WeDidIt account and select 'Upload' from the 'Insights' sub menu in the top left side.
Select the ‘Donor Data’ tab or the ‘Email Lists’ tab, read the Instructions and then click ‘Browse’. Find your updated CSV file.
NOTE: You should have a .csv file with the new/updated data included.
Email addresses are the unique identifier, all other columns in the .csv file will be updated in the Profiles with the same corresponding email address.
After that step the article How to map your donor records will be helpful for the next step of mapping the records.
When the upload history's progress is 100% the profiles are now searchable and the upload has finished with the profiles now updated.