Thank you for reaching out to us through the Community. At this time there is no option to change contact details in bulk. I do apologize for any inconvenience this may cause. With that being said, the best option would be to export all the contacts into a spreadsheet and change their information within the file and then re-upload the file. To do this click on Contacts, then click on the Active section to the left of the page. Check off the box next to Name to select all the contacts and select the Export option to the top of the columns. Once you change all the information within the file, you can then re-upload it and it will mass update all the contacts within the database. For more information on the exporting the contacts click here. I hope this helps. Let us know if you need assistance with anything else.
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