Hi Maribel Da cunha,

first, rather check Frequently Asked Questions:

https://explore.researchgate.net/display/support/Frequently+Asked+Questions

to see how to modify the authors instantly...

Maybe that person were added by RG algorithm (by mistake)... so that is why I do not recommend reporting him/her at first...

Below please find the advise copied from ResearchGate page https://explore.researchgate.net/display/support/Authorship

A researcher has wrongly claimed co-authorship of my publication

Our author match feature is designed to help you quickly confirm authorship of your publications on ResearchGate. The ease of this one-click process means mistakes can sometimes be made, so if another researcher has claimed to be your co-author, it is usually the result of an honest mistake.

If you notice that someone has mistakenly claimed co-authorship of your publication, please contact Community Support with details and a link to your publication https://www.researchgate.net/contact

We take erroneous authorship claims very seriously and review each case manually, so please bear with us.

If, when hovering over a name you see 'Do you know this author?', this is a scientific contributions page. See above for more details.

For more information about reporting content on ResearchGate, see Reporting content on ResearchGate: https://explore.researchgate.net/display/support/Reporting+content+on+ResearchGate

Another researcher has claimed my publications

If another researcher has claimed your publication, it is usually the result of an honest mistake.

To resolve this:

1. Go to the publication page by clicking on the publication's title 2. Click on the arrow to the right of the title and select Claim authorship from the drop-down list 3. Tell us what's happened in the box that appears and, if possible, include links to external services where your work is published 4. Click on the blue Request authorship button.

We take erroneous authorship claims very seriously and review each case manually. As this can sometimes take a while, we appreciate your patience during this process.

If, when hovering over a name you see 'Do you know this author?', this is a scientific contributions page. See above for more details.

Thanks Vladimir Kadets