When your data feed for a channel is ready, it should be uploaded to that channel. This can only be done if you have an account with these channels. For Google, the section where you upload your data feeds is called Google Merchant Center, for Amazon it is called Seller Central, and most channels have their own name.
There are four ways to upload your data feed to a channel.
If your data feed file is located on your computer, log into your channel-account and find where to upload it manually. In the Google Merchant Center, it looks like this: