Hi monica, Welcome to the forums.
I'm in a good mood this morning and I will skip the usual new member hazing. I will tell you that normally a little more searching on your part would be best before posing a simple question such as this. I only say this because it has been covered at least 20 times just this year. So first off, reading some documentation on kismet would probably be good. That can be found here
Secondly what you need is to tell kismet your wireless card (source). This is done by editing the kismet config like this
Go down a bit till you find this part....
And replace the source line with
# Sources are defined as:
# Source types and required drivers are listed in the README under the
# CAPTURE SOURCES section.
# The initial channel is optional, if hopping is not enabled it can be used
# to set the channel the interface listens on.
# YOU MUST CHANGE THIS TO BE THE SOURCE YOU WANT TO USE
Then hold down control and o to exit and save.
The price of this information is that the next time you see it asked you may answer so some of us that answer it all the time do not have to.