There are a lot of videos on YouTube and all over the internet if you just wish to watch some inspirational indoor rowing. From 500m record attempts in someone's front room to Graham Benton's 2016 Crash-B row (stunning) - you can be entertained and inspired with an evening's YouTubing.
But there are also good videos on there to help you with your technique.
Just typing Concept 2 Technique into YouTube will throw back countless videos that all give you a slightly different viewpoint. Some of them will contradict others (like should you let your heels raise off the footplate? Some say yes, a tiny bit - others (like Dark Horse Rowing) say no - you should remain flat at all times.)
However, here are a few videos that hit the mark perfectly to get you started.
Concept 2's own Technique Videos
Decent Rowing - Anthony Edwards takes you through the stroke
This next one is a video from one of the users on the Concept 2 Indoor Rowing Hub on Facebook. It's an amazingly clear and insightful video. It was made to help another user called Aaron - but will help anyone interested in a step by step walkthrough trying to correct somebody's technique.)
A surprisingly simple but knowledgable technique video from the folks at Harvard.