I love MLA, it's the most logical of citing styles. *_*
In the text, when you quote lines, cite it by the last name of author of the work and line numbers (you can include page numbers, but if you give the page span in your bibliography entry, you don't need to. But cite line numbers definitely).
Citing something from an anthology in the bibliography is pretty straight forward. It goes, author[lastname, firstname] (of the work, not the anthology editor), title of work (italics, unless it's an essay or poem), title of anthology (italics), editor of anthology, city of publication., date of publication., page span of the play, medium of publication (e.g. Print)
Here's a thing for citing dramas if you need more info (that even includes a thing about citing from anthologies): http://libguides.pstcc.edu/content.php? ... id=1751573
And while I love talking about citing stuff, it's often much more helpful to just google these sorts of questions about citing. ^_^ There are a lot of official citing guides online made by well known colleges' writing departments for the use of students everywhere (like the one I linked, or Purdue Online Writing Lab is also a great resource).