If you use a Garmin, you can set your Garmin Connect online account to automatically sync to Training Peaks. That means that when you save a workout and sync it Garmin Connect, that completed workout will also appear in Training Peaks ready for you to analyse.
This article will help you with syncing your Training Peaks to your Garmin Connect account.
If you have no luck you can email Training Peaks support here. They are great at answering your technical questions.