Adding Field and Do Field calculator in QGIS

Summary of Steps
1) Open attribute table (.csv) if in csv format
2) use save.as to save to shapefile format
note – if already in shapefil, not need to save again in csv
3) Click the edit (‘Pen’ shape button) of the shapefile
4) Click the ‘Field calculator’ at the most right hand-side of attribute table
5) Choose ‘output field name’, ‘output field type’
6) Expand the function list – eg Geometry, Field and values etc