See this help page for instructions: https://help.researchgate.net/hc/en-us/articles/14293005132305-How-to-add-research. There is no import function accessible to users, so that all bibliographic data including the list of authors has to be added manually. But before adding any publication you should search for its title - it is perhaps already in the database, because ResearchGate imports from various sources. In this case you just have to confirm your authorship. See also https://www.researchgate.net/profile/Petronela-Naghi-2/unconfirmed (visible only to you) - there may be suggestions of your publications not yet attached to your profile.

To add an article, you first need to specify what kind of article you want to add and where you want to add it, as the process varies depending on the platform. For a website, go to the website editor and look for an "Articles" or "Content" section to find an "Add Article" button. For a professional profile like Google Scholar, use the "Add article" option and search for existing articles or add them manually. For social media, navigate to your feed and click "Write Article" or "Create" then "Article" to access the editor.