\documentclass[12pt,oneside]{bidipresentation}
\usepackage{fancyhdr}
\usepackage[RL]{flowfram}
\geometry{paperwidth=225mm,paperheight=180mm,rmargin=40mm,lmargin=4mm,top=10mm,bottom=10mm}
\usepackage{hyperref}
\newstaticframe{30mm}{\paperheight}%
{\dimexpr(\paperwidth-40mm)}% Why minus 40mm? because your rmargin=40mm in your geometry setup
{0.5\paperheight}[sidebar]
\setstaticframe*{sidebar}{valign=b}
\usepackage{xepersian}
\pagestyle{fancy}
\rfoot{\thepage}
\renewcommand{\headrulewidth}{0pt}
\begin{document}
\section{مقدمه} \label{sec:Intro}\newpage
\end{document}