Youtube

Go to Appearance > Customize > Widgets or Appearance > Widgets

1. Choose the Below First Post area
2. Click on the + icon and search for Youtube - Lovelogic
3. Click on the widget icon to add it

1. Edit the title
2. Paste your channel ID. Your ID is not your username. See how to find your id or use this website.
3. Choose how many videos will be displayed.
4. Set the thumbnail resolution