Administrator can define the format of password which will be required when password resetting. By default new password must contain letters, digits and specific signs. In case you need to change these settings, go to web part settings (“Edit Web Part”) and roll down to “Password properties” block. Check the required boxes:
Include letters to password;
Include digits to password;
Include specific signs to password.
When all the required boxes are checked, click “OK” or “Apply” to save the settings.