I have the solution to your enquiry...
In order to add the subtitles to your video you first need to decide which subtitles you're adding (if there are more than one offered) you can find the details of the available subtitles on your DVD file by viewing the DVD within HandBrake.
Once you have located which subtitle you would like to add make a note of which number subtitle it is amongst the list, then
enter the number of the subtitle in the
subtitle field (I think it's under the first tab at the bottom). Don't write "English" etc, it won't work, the subtitle field must contain a number[s].
The only thing is the subtitles come out quite small on the iPod!
