BOT COMMANDS QUEUE REMOVE
Usage: MSG <botname> QUEUE #<name> REMOVE #<selector>

Remove selected message(s)

Example:
/msg SupportBot queue Event remove 3

Deletes or removes a specific message, or a range of messages. A 'selector' selects one or more messages. It can be '1', '1,2,3' or '1-3,4-5' or similar.