MLA = Modern Language Association, a professional society for the humanities and the governing body of MLA Style. Current edition: 8th.
When writing a citation, first identify the  creator(s) followed by the  title of segment (article title, episode title, etc). Each of these will be followed by a period and a space.
Next, look for information about where this thing was originally published. Each element will be separated by a comma and a space.  Title of Container could be the name of a journal, magazine, TV series, website name... whatever it is that your particular source exists as a piece of.
 is where you'll specify any other contributors, like "translated by Name" or "narrated by Name." You'll probably skip this one a lot.  Version can also be edition, whether numeric (7th ed.) or descriptive (Updated ed., director's cut, unabridged version).  Number can include volume and issue, or season and episode number.
 Publisher is whoever put it out to the world, typically a company name.  is the date of that version's publication. For website comments or tweets, include the timestamp.  Location is pretty broad. This could be page numbers, a URL or DOI, which disc in a DVD set, or the physical location of an artwork. Note: MLA 8th ed. doesn't need place of publication for a book!
Repeat the elements of the first container for any additional information you need to provide. If you're looking at a source in its original context, you probably won't need to do this. However, for an article in a database, you would include element  Title of Container (the name of the database, e.g. Academic Search Complete) and element  Location, or the permalink to that article.