How to add subtitles to a DVD that is a TV show DVD?

[BlackAdder2TheRescue]

I have 6 dvds of a DVD show that do not have english subtitles and I want to add them.
I already have the english subtitles in srt format.
I have DVDLab Pro, DVDDecrypter and IFO programs.
How am I going to proceed since each DVD contains 4 episodes with chapters?
I have read the entire guide (that you have posted here) but I do not know how to work with a DVD that has 4 episodes?
Any help would be very much appreciated.
Thanks in advance.

[ricardouk]

http://www.dvdromania.org/content/view/31/56/


good luck

[BlackAdder2TheRescue]

Ok Ive been having some problems with this guide you gave me for the thing that I wanna do (as stated in my first post above).
I did all the DVD Decrypter stuff ok.
I am having problems with the DVDLab pro stuff. I open DVDLab Pro, do step a and then go on to step b.
This is my problem:
When I right click on the white space and Import it says:
For the video: Error wrong ratio
size 575x1537 25.00 fps

and for the sound:
Open GOPs were detected in this file
The file will play fine but chapters points may not srat accurately

After that I cannot go on to do what I wanna do.
What am I doing wring?