Tools/Proxies
It's possible you may need to use a proxy with QSA. The Proxy Manager allows you to define any number of proxies.
The Proxy Manager also allows you to set active proxy once you've created at lease one profile. Creating the profile does not select it for use. You need to select the proxy you wish to use via the drop-down list at the top of the dialog. The main window also provides a drop-down proxy list. Selecting the proxy there changes the program active proxy—same as in the Proxy Manager.
The proxies themselves are defined in the NNTP Proxy Host Profile Dialog