Are you facing problem in Youtube Importer?? After to click on Process button nothing import?? Then please make sure these things.
1- Have you insert API key?
2- Have you enabled API access?
If still your problem is not solved, Then You need to check your error logs, because some hosting servers blocked file_get_contents() function, And we are using this function to get data from YouTube.
So for this you need to contact at hosting support and ask to allow data with file_get_contents() function.
After to allow data from this function , try again and your problem will be solved.
Or if you have access of php.ini file then add these lines in php.ini file.
extension=php_openssl.dll allow_url_include = On
Some Hosting need to enabled OPENSSL extension, So You also need to make sure about openssl extension, Its enabled or not on your server.