BuddyPress.org

What I want to do is add a button ( which I will later style in my css) that will just take the user back to the forum.
So for example a user leaves a reply on an example forum topic and this is their url

http://example.com/groups/biology-bsc-1010/forum/topic/blhdfdsfdfdf/

Then the user clicks the button then this is the url

http://example.com/groups/biology-bsc-1010/forum/

What would be the php to make this button just make the user go back to there group forum page when clicked.

I think this is the file I have to work with : bbpress/loop-replies.php

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I see this part which I think is what has to do with my question :

<?php do_action( 'bbp_template_before_replies_loop' ); ?>

<div id="topic-post-list" class="item-list" role="main">

<div class="forum-head-reply-tools"><?php bbp_user_subscribe_link('before=&nbsp;'); ?> <?php bbp_user_favorites_link(); ?></div>
<div class="clear"></div>

<ul>
		<?php while ( bbp_replies() ) : bbp_the_reply(); ?>

			<?php bbp_get_template_part( 'loop', 'single-reply' ); ?>

		<?php endwhile; ?>
</ul>
</div><!-- #topic-<?php bbp_topic_id(); ?>-replies -->

<?php do_action( 'bbp_template_after_replies_loop' ); ?>

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I found this that might be of use <?php bp_group_permalink(); ?>/forum

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I need help putting this all together to make it work, Iv tried but with no success