Hi, I will try to help you (but it is not fully clear to me, what you exactly want).
As indicated by other members, this "notes" are for diatonic accordion.
+/- indicates the bellow opening or closing (or closing/opening).
This song starts with higher tone, so if you push button 3, you can try to open bellow and close bellow - your song starts with higher tone. At this time you know, if "-" is used for opening or closing (must be higher one).
So you will start song in the right direction with pushing button 3, than 1 , 2 and 3 (I expect notes A AA A AA A D F A ...).
In second part you will use the other direction, but the same buttons (they now play G GG G GG G C E G ...) etc.
In case, that your instruments sounds in both directions the same way, this is not the diatonics one and you have to use other "manual".
Hope my english is ok for you and answer give the sense

.
Regards,
Jiri