Where to get some users to participate coursework Usability research?

I am following an online course which involve some usability research topics and assignments.
Any recommendations where to get some user to participate in simple research?
Since it’s course work, I would like to get users from different pl…
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Users are confused and think search filter are input boxes. How best to indicate that they are for filtering search results?

Users are confused and don’t understand the boxes on top of the summary page are for further filtering the results. Some think the boxes are to enter new values. What is the best way to indicate these are search/filter options?