Hi @marisa_m_delsav,

It looks like you're in the moderate area for a single quiz, which is slightly different form accommodations (which are for all new quizzes in a course).  The accommodations is where you'll have the option for a time multiplier, since every quiz may be a different length.  I do think the UI for this has had a recent change, so you may want to quickly review the  How do I add accommodations for a student in New Q... - Instructure Community - 1092  guide for the current steps to add an accommodation for a student.

I'm going to mark this as the solution, but please feel free to come back and let us know if this doesn't actually answer your question.

-Chris