The house is being marketted by Coldwell Banker. They are listing the home. Your choices are as follows:
1 – Call the listing agent and ask her to represent you. Discuss your strategy with her and see what she thinks.
2 – Call the listing agent and tell her you would like to make an offer and that you will not be represented. Ask her what steps she would require you to take in order to convey your offer.
3 – Get an agent to represent you. That agent will make sure all of the proper documentation is used.