Exporting your test case is very easy...
Which test cases would get exported depends on applied filters on test cases page, if there are no filters then all the test cases within the project would get exported. You can also use checkboxes to select specific test cases to export.
Exporting data with columns currently visible on grid
If you do not want all the columns to be part of exported data then you can opt to export data only for columns currently visible when you click on Export button.
Tip: Columns visibility can be managed using "Columns panel" of grid.
The exported data however will always have steps and expected results columns.
Sequence of test cases in exported CSV
If you have sorted test cases on one or more columns on grid then the order would also be followed at the time of exporting the test cases.
User with rights to export test cases would only be able to perform this action.