Where can I find the folder to edit iframe video for blog?

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HI, I am using the ella theme and can not or the life of me find out where the does the code go for the iframe videos that are in my blog. What folder do I go in to find the code so I can edit it? I tried the article folder and also the theme liquid and can't find it. Help! 


This is the code I am trying to find ... it it written differently or something in a folder?  <iframe width="560" height="315" src="" frameborder="0" allowfullscreen=""></iframe>


Also do you know how to make it responsive so it sizes down correctly in mobile view?