How do I cut the length of a track in Ardour

You don’t necessarily HAVE to upgrade your distro, but please at least find a way to upgrade Ardour. At this point we couldn’t provide any support for any bugs you found primarily due to the age of your package and the fact it has likely been fixed(And the next 20 you find) between that release and our current one.

    Seablade

I have it on “grid” and moved the end marker to the spot i’d like to crop. However, in the edit menu, the crop button is disabled (looks like bold text). How can i enable the crop?