ConvertX to DVD 3 cut off subtitles!

I very new to computer, have friend tell me use this program ConvertX to DVD 3, but confused by problem!

After make menu and set to burn, then put finished DVD in player to watch, bottom of show is cut off. Make from AVI’s that already have subtitle, and subtitle is being half cut off. How to fix this? :sad:

Sorry bad english, thankyou!!

http://club.cdfreaks.com/f32/subtitles-getting-cut-off-screen-127537/

Found answer in other topic, thankyou!!