Adding, editing, and removing co-author information is well described topic at RG Help Center page:

https://explore.researchgate.net/display/support/Authorship

Dear Veronika Siebenkotten-Branca ,

I suppose you want to change/remove an author of an article of your RG publication list.

So please go to your RG publication list and open the article page by clicking onto the title.

At the right side you will find a down arrow close to the blue 'share' button.

By clicking on that down arrow a drop down menue will be opened having an 'edit' option.

By clicking on that 'edit' you will get access to the article details.

For changing something in the author list you have to click at the 'Request edit' button in the author section. It will take a while (some minutes) and then you will be able to do the changes.

Please do not forget to 'save' your changes by pressing the 'save' button.

After that any further changes in the author list are automatically blocked by the RG administration for at least 24 hours.

So in this case be patient...

Good luck

Tank a lot for your help , I suppose it worked !

Adding, editing, and removing co-author information is well described topic at RG Help Center page:

https://explore.researchgate.net/display/support/Authorship

Thanks for your advice . I tried it twice and it give a note that there is a procedure taking place and after a few days nothing happened , too bad

So Veronika Siebenkotten-Branca ,

you should get in contact directly to the researchgate people with respect to your issue by the aid of the contact page:

https://www.researchgate.net/contact

Please use the down arrow of the 'Please select' line at the lower third of the page and scroll down to 'other' option.

Or simply use:

[email protected]

as E-mail address

Good luck...