You need to provide two columns - one is the step, the other the measure - with multiple rows.
SELECT 'Registered' AS Step, 31159 AS Count UNION ALL SELECT 'Info_first' AS Step, 28372 AS Count UNION ALL SELECT 'Info_second' AS Step, 21494 AS Count UNION ALL SELECT 'DOI' AS Step, 19317 AS Count UNION ALL SELECT 'Verified' AS Step, 12284 AS Count UNION ALL SELECT 'Paid' AS Step, 1522 AS Count
Because that’s how the visualization looks like, it’s currently not possible to make it vertical.
I hope that the function of making it vertical will be added as soon as possible.
I think it's in this other post I just answered.