At the top right above the report, click the "Fields" icon to access a list of the fields. Use the checkboxes to add or remove fields.
Reorder Data/Columns
Safari offers you two options for reordering the columns of data. If you're editing the fields of data to include in a report, click-and-hold your mouse on the "grip tape," and then move the field up or down:
Or, if you are viewing the report table, click-and-hold your mouse on the column name, drag the column to where you want it to be, and then release your mouse.
Sort Data by a Column
Place your cursor over a column header, and to the right of the column name you'll see an up or down arrow. Click the arrow to change the sorting in the table by that column. Click the arrow again to change the sort direction.
Filter Data
Click on the column name (which has the same effect as clicking on the "gear" icon in the header). This activates a standard filter similar to Excel.

TIP: If the field is a date field and you want to apply date range filters, you must first click the "Dates" button, and then you will be given a series of options to apply date filters.