YouTube launched a tool by which you can easily create an interactive end screen to your video. The end screen plays 10 or 20 seconds at the end of your video, with clickable links to your own video's or your own channels and website.
Use the end screens at the end of a video to:
Point viewers to other videos, playlists, or channels on YouTube
Call for subscriptions to your channel
Promote your website, merchandise, and crowdfunding campaigns
How to set up YouTube end screens
Navigate to YouTube Creator Studio, select Video Manager, go to the video you want to add an end screen to and click Edit. In the top tab bar, click End screen.
You directly go to the last 20 seconds of your video. Now you can add several elements: a link to a video or playlist, a subscribe button, another YouTube channel or your website.
Just drag and drop the clickable link wherever you want and adjust the size as you wish. You can place other links or a subscription button in exactly the same way.