Your article should start from the usual stuff: title, author(s),
affiliation(s) and abstract:
\documentstyle[hip97]{article}
\begin{document}
\title{Title of the paper}
\author{Author1\inst{1},
Author2\inst{2} and
Author3\inst{1,2}}
\institute{LocationA \and
LocationB}
\maketitle
\begin{abstract}
Text of the abstract.
\end{abstract}
As you can see, the affiliations should be put into '\institute'
command. If you use more the one affiliation they should be
separated with '\and' command and they should be accessed in '\author'
command with '\inst' command.