\documentclass[12pt,a4paper]{article}

\usepackage{amssymb}

\usepackage[margin=2.6cm,noheadfoot]{geometry}

\begin{document}

\thispagestyle{empty}

\begin{center}
{\Large\bf{Title of your poster}}
\end{center}
\begin{center}
{\bf  Your name, your university}
\end{center}

Your abstract...

\end{document}
