You can link to your YouTube page in two ways:
A: Link to the main channel – The user will see all your recently uploaded videos and your favorites and he will have to click the “Subscribe” button in order to subscribe to your channel. See example:
B: Link to the subscription page – The user can directly subscribe to your YouTube channel after clicking that confirmation button though he won’t necessary see your YouTube page. See example:
The graphics are available in all popular sizes so you may even use them as stickers or print one on your business card.