Hi,
MSM knows where the manual is. The first time MSM has to show a PDF file, it needs to learn where the PDF reader is on your machine.
Please try the User Manual button again and look at that dialog box - I bet the title is
"Please Enter PDF reader Full Path and Filename"
If that's the title, it's asking you to tell it where to find the PDF reader.
Assuming you are using the Adobe Acrobat reader, it is in the program files directory on most machines.
The exact location is dependent on the version of the reader you have.
For example if you have version 9 it is typically
c:\Program Files\Adobe\Reader 9.0\Reader\AcroRd32.exe
Use the browse button to find PDF reader and MSM will then open the manual.
Once the PDF reader path is known, MSM remembers it, it won't ask you again.
Dave