documentclass[preprint,12pt,authoryear]{elsarticle}

begin{document}

begin{frontmatter}

title{Abc Def Efg}

author[uni]{Jack Nimblecorref{cor1}}

ead{jack.nimble@jackox.uk}

cortext[cor1]{Corresponding author}

author[uni]{John sly}

ead{john.sly@johnox.uk}

address[uni]{Department of Latex, University of JohnOx, Oxbull O1 011, UK}

begin{abstract}
The aim of this article is to conduct a research and report it.
end{abstract}

begin{keyword}
Research sep Latex

end{keyword}

end{frontmatter}

.....


end{document}