Hello ikhwanulfikri,
Open up
showthread.php and find:
add_breadcrumb($thread['displayprefix'].$thread['subject'], get_thread_link($thread['tid']));
Remove that line.
Alternatively, go to ACP > Templates & Styles > Templates > Your Style > Navigation > nav and remove:
{$activesep}{$activebit}
(Thanks to effone for the idea below)
Go to template "Navigation Templates > nav"
and remove this variable:
{$activebit}
Edit:
@AndroidOS: Core edit is not required if it can be done by template edits.
Core edits will affect to all themes and increase pain while upgrading.
Fair enough effone, I have edited my post, as you missed a bit out of your edit as well (for most themes, anyway).
The snapshot he has provided is with activesep, if you review :p
So it is, I guess it depends on your theme really.
