I have found it:
The field "Feedback Options" shows the help text: Feedback options are available if your questionnaire contains the following question types and question settings: Radio buttons; Dropdown box or Rate. Those questions must be set as Required, their Question Name field must NOT be empty and the Possible answers choices must contain a value.
But...this field and its help text is not visible when the fields are not set to required.
So the procedure is (:
Set "Display charts for "Personality Test" feedback" to "Yes" in Questionnaire settings (Site administration-->Plugins-->Activity modules-->Questionnaire)After that create new Questionnaire and when adding questions set the "Response is required" to "Yes", because this data will be used in charts. IF NOT SET TO REQUIRED: you will not see the advanced settings as described below.When all questions are entered, go to Yours Questionnaire "Advanced settings" and look there for "Feedback options". There You can set up a chart and various ways how to show results.Pay attention that if you use 1 feedback, then there will be only charts with single column available. If use 2 or more, then another charts will be available to use. More detailed information is in Questionnaire Personality test.