Upload the .swf File to your webspace. When you upload the file to a location other than the root-directory, you will need to alter the html-code (please see below).
<div style="position:fixed;top:200px;right:0px;width:75px;height:185px;">
<object width="75" height="185">
<param name="movie" value="scrollbar.swf"></param>
<param name="allowscriptaccess" value="always"></param>
<param name="menu" value="false"></param>
<param name="wmode" value="transparent"></param>
<param name="flashvars" value="username=your_id_here"></param>
<embed src="scrollbar.swf" type="application/x-shockwave-flash" allowscriptaccess="always" width="75" height="185" menu="false" wmode="transparent" value="username=your_id_here"></embed></object>
</div>
If you upload the button's .swf file to a directory other than the root-directory, you will need to change the code. To do this you will need to replace value="scrollbar.swf" with the directory name or your domain (URL), for example value=http://www.yourdomain.com/flash/scrollbar.swf. You will need to make this change twice within the above code, once in the movie-parameter and a second time in the embed src="..." value.