To access bulk actions, select the items you are interested in, and the bulk actions will appear in the top row of the table.
All that is necessary is checking at least one item, and you will see all applicable bulk actions appear, replacing column headers.
For example, if you are on the Manage Students page, simply check one student to see the bulk action items appear. You also have the option to select all, without manually checking every single box.
Another example is found on the Employer page, where you can make your selections in order to see the Bulk Action items appear.