If your plan expects the management of content via CMS, the management of the articles must be enabled for the operators in order to manage it. To proceed, it is necessary to modify the personal data of the user to be enabled from : menu > USER MANAGEMENT > USERS> select the concerned user > EDIT > in the personal data sheet check "CMS Editor", one of the last items at the bottom. Now that the user has the ability to manage CMS articles.

Suggestion: it would be advisable for the operators who will have to manage the CMS to have a minimum of previous experience in the use of a CMS, in order to be already familiar with the topic.