\documentclass{seminar}

\usepackage{amsmath} % pkg required by EasyLatex
\usepackage{amsfonts} % pkg required by EasyLatex
\usepackage{amssymb} % pkg required by EasyLatex
\usepackage{psfrag} % pkg required by EasyLatex
\usepackage[dvips]{graphicx} % pkg required by EasyLatex
\usepackage{slidesec} % pkg required by EasyLatex
\begin{document}


\begin{slide*}
I'm a slide
\end{slide*}

\end{document}