Make sure your computer is connected to the Internet. While a slow Internet connection would serve the purpose, it would take a toll on the overall viewing experience because of the frequent buffering. Therefore, try to get an Internet with good speed.
Open your Web browser and go to youtube.com. Sign in using your username and password to get full features of the websites. If you do not have a registered account on YouTube, you will neither be able to use the playlist feature, nor view age-restricted videos. Therefore, be sure to create an account on the website. It would hardly take you 3 to 4 minutes to get done with the account-making process.
Once you have signed in, scroll the cursor to your username and select “Account” from the drop-down menu.
Select “Playlists” from the drop-down menu and click “New.” Enter a name for the playlist and then click “Create.”
Click the YouTube logo to go back to the homepage and search for the video that you want to watch. Click on it to start playing it.
Look for the “Playlist” button right below the video window. Once you have located the button, click on the “+” button right next to it.
Select the playlist that you created from the box and click on “Add to Playlist” to complete the process of adding the currently playing video to the playlist.
Repeat the process for other videos that you wish to add to your playlist.