To start using Feeds that you generate in EffectConnect's Feed Manager, you'll need to follow a few steps. First of all, you need to know what a feed is for, and which feed you need. Do you need a CSV or XML file, for example? And with what information? You can read more about that here.
You also need an account for the Feed Manager, how to get an account can be read here.
Once the above steps have been completed, you can start building your feed. The step-by-step plan can be found here. Keep in mind that a subscription is necessary before you can generate or export a feed. More information about the different subscriptions can be found here.