How do I mass-delete threads?

[teedizz]

I have a ceratin forum that has over 20,000 threads & I want to delete the particular forum or just empty it by deleting the threads inside but since I couldnt figure out how to mass delete the threads inside I just moved the threads to another forum called trash & when I try to delete that forum I get a error that says

Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 3374 bytes)

Does anyone know how I can delete that forom or remove the threads from inside of it?

[RS_Jelle]

Edit memory_limit in php.ini (vBulletin needs 16M). Then you need to restart your web server ;)

[Boofo]

Why not use the inline moderation?

[teedizz]

Edit memory_limit in php.ini (vBulletin needs 16M). Then you need to restart your web server ;)

how do I do that?