How to add block to panel?

1. Custom blocks
    - Go to structure / block and add new block
    - Go to Panel and add content, select custom blocks. You will see your block to add to panel.
2. View block
    - Create view blocks
    - Go to panel and add content, select miscellaneous. You will see your block to add to panel.
    - If you can't see view block on miscellaneous. Go to Modules menu, find the module Views content panes and uninstall it. After uninstall views content panes module come back the panel. You will see view block on the miscellaneous.