steps 1 and 2 are not correct.
do not create a new connection file and change the code.
instead, edit the existing connection that security assist was configured with, and change the details in the connection for the remote database server. To do this, go to Window -> Databases, then double click the connection.
Once the updated connection has been uploaded to the server, and you have tested to make sure the connection is working, follow these steps:
1) in the Dreamweaver files panel, Change the Local View drop Down List to Remote View.
2) Open the connections folder and right click on the connection file, select Set Permissions
3) Uncheck the write permission for all three users to make the connection file read only.
Now in the Dreamweaver file panel, go back to local view.
Edit the connection again in the database panel to set it back to using the local credentials.
Since the connection on the remote server is now set to read only, Dreamweaver will fail if it try's to overwrite the remote connection with the local one.