A jQuery file is only about 100KB and available to be cached, so don’t worry about the speed of your page after embedded it. To embed jQuery, please access your blog Template and click Edit HTML
Open Template Code Editor
Before insert jQuery, you must check that is it alreay installed in your template? Please find “https://ajax.googleapis.com/ajax/libs/jquery” if you found nothing, mean you need to continue, if yes, just stop and do nothing because your template had a jQuery library.
In template Editor window, find the tag and insert before it with the below line:
Then click Save template.