Hi Anna-Lena,
MLA doesn’t provide any specific guidelines for citing YouTube comments, but you can use the general template of core elements to create an appropriate citation. The most important thing is to make sure your reader can easily locate the relevant comments themselves.
I’d suggest following a similar format to citing a tweet: list the commenter’s username as author, followed by the text of the comment in quotation marks (shortened if necessary). You can add a label to clarify that this is a YouTube comment. Then include details of the video as container. So, for example:
Anna-L. “Thanks for the help!” YouTube comment. “Develop a Theoretical Framework in 3 Steps.” YouTube, uploaded by Scribbr, 10 Jan. 2021, http://www.youtube.com/watch?v=4y1BAqOnhMM.
I hope that helps!
]]>Best regards
Anna-Lena