Contact the primary author and the journal's editorial team for unauthorised inclusion of your name in the paper. Provide any evidence of non-consent and inform co-authors.
I guess you mean how to remove your name as author from the bibliographic data in ResearchGate. See "A publication in my profile doesn’t belong to me" in https://explore.researchgate.net/display/support/Authorship for instructions how to remove this publication from your profile. This is a frequent problem in ResearchGate in case of similar names, caused by an automatic algorithm of RG.