How do you reach a member by user name if you are not connected?

[bsacco2]

I found user gntreg184468 via "search your ancestors" search function to have a census record of my ancestor Jean GRANGIER

Jean GRANGIER:
Born, July 16 1818
Tarascon (Bouches-du-Rhône, Dept. 13, France)
Died, Jan 2 1894
Tarascon (Bouches-du-Rhône, France)

His wife was Madelaine BARD
born, Nov 18 1821
Tarascon (Bouches-du-Rhône, Dept. 13, France)
Died, Apr 30 1894
Tarascon (Bouches-du-Rhône, Dept. 13, France)

I am seeking to find the complete ancestry moving back in time. I seemed to have found Jean's father and mother:

Claude Augustin GRANGIER
Died, Sep 4 1835
Tarascon (Bouches-du-Rhône, Dept. 13, France)

Marthe Sauveur Juillioz
Died, Aug 29 1836
Tarascon (Bouches-du-Rhône, Dept. 13, France)

I have also found partial information regarding Claude's father but I am stuck here at Guillaume and do not have his wife's information.
Guillaume GRANGIER
died, 1786
Beurières, Ladinhac, France
Deceased

My question is I would like to reach out to this user to see if they have more information regarding the GRANGIER surname but don't know how to do so since we are not connected. Is this possible using Geneanet? Also, do you know another method of using Geneanet to gain more information regrading the GRANGIER surname? THank you - Robert

[jyb]

"gntreg184468" is a collection of censuses from Tarascon and there's no additional information.