\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 slide 1

\end{slide}
\begin{slide}

I'm slide 2

\end{slide}
\end{document}