Here are the requirements for creating a password on your Fieldguide account:
Must be 8 characters in length
have a lowercase character (a-z)
Have an upper case character (A-Z)
Have a number (0-9)
Have a special character (!@#$%^&*)
If you use SSO (single sign on) to access Fieldguide, your password requirements will depend on your company's policy, and may differ from what you see here.