Hello Babs, it was only after looking at the youtube link that I realised the reason for at least some of the confusion. Whereas we in the UK and other English -speaking nations use do-re-mi-fa etc to indicate the note positions and relationships of a scalein any key, in most of continental Europe they mean specific pitches (notes or keys). So for Fabio:
Do meansC
Re meansD
Mi means E
Fa meansF
Sol meansG
LameansA
TimeansB.
In the video he is playing the song in the key of G, (orSol, as he would call it), and the Fa# is simply an F#, the seventh note of the major scale in that key. There is no need to bend a string to get the note: if you wanted to play the tune in the same key as him one way would be to tune DGdd - the F sharp would be at the second fret, just below the tonic note of G at the third fret. If you wanted to be one octave higher, these two notes would be at the 9th and 10th frets respectively.
If you wanted to stick to your original plan of transposing the piece to the key of D, using DAdd tuning, the equivalent note in that key would be C# (the seventh note in a D major scale). In this tuning C# would be at the second fret of the middle string or at the 6+ fret of the melody string(s), depending on which octave you wanted.
