editing an existing site using dream weaver

i want to add a simple image in existing website using dream weaver. I have connected the site to dreamweaver by the proper method that is go to site then putting all the information regarding ftp server and in end when i click on test it says that i have connected it properly now what i want to know is, what is the next step in order to upload any picture in any specific place

will be very grateful if anyone quickly assist me!