SOFA expects your data to be organised in a particular way. E.g. should I have gender as a field with 1s and 2s in it and height as another field or should I have a column of results e.g. height, for each gender? SOFA only works with the first structure. Check Structuring Data For Analysis if not sure or if there are problems.
SOFA Statistics currently supports importing data from Excel spreadsheets, ODS spreadsheets (OpenOffice Calc and Gnumeric etc), csv files and Google Docs spreadsheets.
NB you do not need to import data from SQL-type databases (currently MS Access, PostgreSQL, MySQL, MS SQL Server, and SQLite). See Connecting to databases
A video is available showing how to import CSV data: Importing CSV data video
A video is available showing how to import Open Document Format (ODF) spreadsheets: Importing Open Document Format (ODF) spreadsheets video
Another video is also available showing how to import data using SOFA Statistics: https://www.youtube.com/watch?v=bi59lO9JwWI