CritterCoin gives you multiple ways to get your teacher data into the system. There are two options. The first is to simply add teacher by pasting your data. The second allows you to upload a spreadsheet and synchronize your teachers. This option is most useful for adding and removing teachers from your account from year to year since it will help you remove teacher users that are not found in your spreadsheet.
Option #1: Adding teachers by pasting spreadsheet data
On the Teachers page the "Import" button allows you to paste in data from a spreadsheet. The spreadsheets must have an email column. Simply copy your data (without the headers) and paste it into the dialog, then click "Next"
Option #2: Synchronizing teachers by uploading a CSV spreadsheet
On the Teachers page the "Sync with CSV" button allows you to upload data from a spreadsheet. You can see a sample CSV format here.
Simply fill in your teacher data, one teacher per row below the header row. Next save your file as a .CSV and upload it, then and follow the instructions.