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From the OWL resource MLA Formatting and Style Guide
Footnotes and Endnotes
Because long explanatory notes can be distracting to readers, most academic style guidelines (including MLA and APA) recommend limited use of footnotes/endnotes; however, certain publishers encourage or require note references in lieu of parenthetical references (see the MLA Handbook, Appendix B, and the MLA Style Manual, Appendix A, for other systems of MLA citation).
MLA discourages extensive use of explanatory or digressive notes. MLA style does, however, allow you to use endnotes or footnotes for evaluative bibliographic comments, for example:
You can also use endnotes or footnotes for occasional explanatory notes or other brief additional helpful information that might be too digressive for the main text:
Numbering Endnotes and Footnotes
Footnotes in MLA format are indicated by consecutively-numbered superscript arabic numbers in the main text after the punctuation of the phrase or clause the note refers to:
However, note references appear before dashes:
Do not use asterisks, daggers, or other symbols for note references. The list of endnotes and footnotes (either of which, for papers submitted for publication, should be listed on a separate page, as indicated below) should correspond to the note references in the text.
Formatting Endnotes and Footnotes
The MLA recommends that all notes be listed on a separate page titled Notes (no quotation marks or italics), which should appear before the Works Cited page. This is especially important for papers being submitted for publication. The notes themselves are listed by consecutive superscript arabic numbers and appear double-spaced in regular paragraph format (a new paragraph for each note) on a separate page under the word Notes (centered, in plain text without quotation marks).
In the case that you need to format footnotes on the same page as the main text, footnotes should begin four lines (two double-spaced lines) below the main text. Single-space notes formatted as footnotes on the page, but double-space between individual notes.