So you can be an op, you need to register, you can do that by running this command:
/msg nickserv register your_password your_email_address
To become an operator on #arlingtonruby:
/msg chanserv op #arlingtonruby
To make someone an op:
/msg chanserv flags #arlingtonruby csexton +o
To remove someone from a channel (if you are an op)
/kick radbot
To ban someone permanently
/msg chanserv FLAGS #arlingtonruby radbot!*@*.amazonaws.com +b
/msg chanserv FLAGS #arlingtonruby craig-pennyworth!*@*.amazonaws.com +b
For more see the Freenode Using the Network guide.
To remove op status for yourself:
/mode #arlingtonruby -o csexton
or
/msg chanserv deop #arlingtonruby