Be sure to have USB or removeable drive connected to your computer
In Windows Explorer, search ‘BitLocker’ and select ‘Manage BitLocker’
When BitLocker opens, select ‘Turn on BitLocker’ beside your USB or removable disk
Select the check box for ‘Use a password to unlock the drive’ and create a suitable password
Save or print your password in a safe place. If you lose this, you will not be able to recover the data on the drive
Continue through selections. Be sure to select ‘Compatible Mode’ when choosing which mode to encrypt, as this is best for removable drives
After you encrypt your entire disk, it will always ask for the password when used.