I'm having problems doing this I'm USING a broadcom card and have wireshark and winpcap
how do put it into monitor mode?Without even giving the OS you want us to guess what you are talking about.  Both are network monitors and have nothing to do with your visual display device.
Now if you are using Linux, it should be obvious you have to start a CONSOLE session.

Or do you mean the broadcom card is a network card.?
Which broadcom?
Does this apply?
Thread: Problems monitoring Network throughput - Broadcom Team
Please give more information for better answers.

WinPCap puts most NICs into promiscuous mode automatically.  BEAR in mind that the NIC can only see traffic that is on the same network leg.  If you're CONNECTED by cable to a network switch, you will not see all traffic going through that switch unless the switch has the capability of setting a port to "mirror" mode, whereby all traffic on the switch is copied to that port, whether it's intended for the device on the other end or not.

This is the big difference between hubs and switches of course.  Hubs copy all traffic to all ports indiscriminately.  Switches try to route traffic intelligently by keeping track of IPs and MAC addresses in a dynamic ARP cache.