In order to set up a password for a specific folder with BitLocker, follow these steps:

1. Open your Start menu and search for ‘BitLocker.’
2. Once you’ve located the program, open it up on your computer.
3. Choose the folder that you would like to secure.
4. Select the ‘Turn On BitLocker’ option.
5. Choose a password for that specific folder.
6. Hit the ‘Save’ button.

You have now successfully set up a password for your chosen folder with BitLocker.