I am using a child themes. I read your instructions on setting up the child themes configuration. I copied the folder
Souce:wp-content/plugins/bbpress/templates/default/bbpress
Destination: /wp-content/themes/%your-theme%/bbpress/

Bbpress will normally use the default files found at
wp-content/plugins/bbpress/templates/default/bbpress

However if you create a directory in your child theme at
/wp-content/themes/%your-theme%/bbpress/
(where %your-theme% is your child theme’s name)
then any files stored there will be used instead.

Thereafter, there appears two “unsubscribe” button in the forum. Before copying the “bbpress” folder to the child-theme, I only see one unsubscribe.

http://goforcrumbs.com/forums/forum/intro/

[@goforcrumbs Participant 8 years, 12 months ago]

Step by step guide to setting up a bbPress forum – part 3

The usage of child theme is to avoid overwriting any customization that you have done to your site by a theme/plugin upgrades. So you maintain a separate set of files in different folder than the out of box themes or plugins. This way whenever there are new upgrades and get pushed and overwrite your files, it won’t overwrite whatever customization you had.

[@goforcrumbs Participant 8 years, 12 months ago]

I found the culprit!

The file in questioned is “content-single-forum.php” in “bbpress”.

Removing the line below solves the problem.
<?php bbp_forum_subscription_link(); ?>

[@robin-w Moderator 8 years, 12 months ago]

great – glad you’re fixed !