See https://help.researchgate.net/hc/en-us/sections/4405078552209-Profile on how to change your profile and the following help page for instructions how to add published or unpublished research: https://help.researchgate.net/hc/en-us/articles/14293005132305-How-to-add-research
See also "How do I edit my research item's details?" in https://help.researchgate.net/hc/en-us/articles/14293081125777-Reviewing-editing-and-featuring-your-research for instructions how to change bibliographic details.