Alignment of an image

Hi All

I would be grateful for some help on the alignment of an image on my home page.

https://www.greenbananaguide.com

I have a sign up form on the right hand side with a image panle underneath which is offset. I would like the image to be central and in line with the sign up form.

The sign up form and image are in the sidebar, so I think I need to make some amendments to the sidebar.php but I am not sure how.

Any advice would be great.

Thanks

I have put the sidebar code here:

<div class="sidebar1">
<!-- Web Form Generator 2.0 -->
<center><form method="post" action="https://www.aweber.com/scripts/addlead.pl" target="_new">
<input type="hidden" name="meta_web_form_id" value="1681709152">
<input type="hidden" name="meta_split_id" value="">
<input type="hidden" name="unit" value="greenbanana">
<input type="hidden" name="redirect" value="https://www.thegreenbananaguide.com/gbgthankyou.html" id="redirect_12ba9144f1c4205d1ebba3da8b7397b0">
<input type="hidden" name="meta_redirect_onlist" value="">
<input type="hidden" name="meta_adtracking" value="">
<input type="hidden" name="meta_message" value="1">
<input type="hidden" name="meta_required" value="from">
<input type="hidden" name="meta_forward_vars" value="0">
<table>
<tr><td colspan=2><center><div>Download our magazines FREE!</div></center></td></tr>
<tr><td>Name:</td><td><input type="text" name="name" value="" size="12"></td></tr>
<tr><td>Email:</td><td><input type="text" name="from" value="" size="12"></td></tr>
<tr><td>Tel No (optional):</td><td><input type="text" name="custom Tel No (optional)" value="" size="12"></td></tr>
    <tr><td colspan=2><center><div><font color="#ff0000"><strong>Don't Forget to Order Your Discount Card</strong></font><br /><h1><a href="https://www.greenbananaguide.com/?page_id=267" class="style1">Order Now</a></h1>
</div></center></td></tr>
<tr><td align="center" colspan="2"><input type="submit" name="submit" value="Submit"></td></tr>
</table>
<img src="https://forms.aweber.com/form/displays.htm?id=jGwcjOwMnIysTA==" border="0" />
</form>
</center>

   <?php include (ABSPATH.'wp-content/flashfader/flashfaderhtml.txt'); ?> 

	   <?php// if ( function_exists('dynamic_sidebar') && dynamic_sidebar(1) ) : else : ?>

           <!--<li>-->
           <!--<h2>--><?php// _e('Categories'); ?><!--</h2>-->
              <!-- <ul>-->
               <?php //wp_list_cats('sort_column=name&hierarchical=0'); ?>
               <!--</ul>-->
          <!-- </li>-->

	   <?php //endif; ?>
	   <!--</ul>-->
   </div>