There seems to be an option to put the 'option comment' after the input but for the life of me I don't know where you set that option! It has to do with the variable $option_comment_position in the code but lord knows where you set that in Admin. It seems to be configurable for each individual option comment. Anybody?
That would be easiest 
Then you just put the link into the option comment.
But if you can't find where to set that up.
The you could try this.
In tpl_modules_attributes.php find the line:
Code:
<div class="back"><?php echo "\n" . $options_menu[$i]; ?></div>
And change it to:
Code:
<div class="back"><?php echo "\n" . $options_menu[$i]; ?><?php if($new4=='selectbackground'){ echo 'link here';}; ?></div>
Then you can change the link here to whatever you want.
(I think I have got the 'selectbackground' right but you might want to check that I have set this if statement right)
PS You can probably take those green borders out if you are happy with how it looks :-}