I'm running Macromedia Dreamweaver and using it to make forms. I've set everything up except the Data Source Name (DSN). What is it and how do I connect to Hostony with it?

Dreamweaver works using FTP.
DSN: your domain name
or
ftp://your_domain.name

Whenever I define a connection in Macromedia Dreamweaver and test it, an error keeps occuring.

Can you check if the following info is correct?

Connection name - conn_test
Data source name - ftp://test.go-getglobal.com
Username - test
Password - {}

When I test it, an alert pops up: "HTTP Error Code 405 : Method Not Allowed".

You have to use only GET/POST methods. You are using another methods which cause this error.