Thanks for the feedback and sorry for the inconvenience!
The sign-up page actually does include the password requirements: "The password must be at least 8 characters long and include upper and lowercase letters, numbers and symbols."
In sum: * 8 chars long minimum * include all of these: upper and lower case letters, numbers and symbols
I do realize that such a combination of characters is somewhat hard to remember compared to simpler passwords. I'll consider options to simplify all this.
I appreciate your feedback.