Putting a diagram at the top/bottom in the two column document

Question

I am trying to put a graph on top or bottom of the page with text. However when i use the code found on this website:

\begin{figure*}[!b]
 \centering
 {\includegraphics[width=0.9\linewidth]{Graph-for-Malus}}
 \label{Fig. 5 Graph for Malus' Law verification}
 \caption{The graph shows the obtained results of the experiment plotted and the relationship between the intensity and the angle $v$ follows $cos^2(v)$ relationship very accurately.}
 \vspace{-13cm}
\end{figure*}

That results on the graph being put on the next page and not on the page i want it to go. I tried a lot of different variations of the code and nothing seems to be working.