First thing when trying to add a new case/respondent to your datafile, in Editor Mode you need to:

+ switch tab, from 'Variables' to 'Data'

+ here you'll find the ''Append Case' icon in the Edit toolbar to add a single, empty case. Hit the button and a new empty case is inserted at the end of the file, as the last case, and must be filled manually.

+ fill the fields manually and after entering the data, provides an on-time saving.

You can follow the steps described above by checking the video on our Youtube channel. This procedure is considered good in terms of time spent, when you have to insert manually one or few cases, but in case you have a file (even of different file format from a .ddf2 one) you can use the procedure for 'Appending a file of respondents'.