The mentioned 0Eh offset is a byte offset within the boot record containing the number of reserved sectors.
The first reserved sector is sector 0, so any offset from 0 to the number of reserved sectors multiplied with the sector size in bytes, will be in a reserved sector.
Using the code from the article I linked to, you'd want to specify the offset in the Windows NT read/write functions like so:
SetFilePointer(hFloppyDisk,offset,0,FILE_BEGIN);
For example, let's assume we have sectors with a size of 512 bytes each and let's say you'd want to access sector 3. You'd want to set the file pointer like so:
SetFilePointer(hFloppyDisk,3*512,0,FILE_BEGIN);