DISAPPOINTING

I simply wanted to make an easy tab to teach "O Canada" to a beginner. Theres no help button or instructions and its not as user friendly as it claims to be. Also it seems limited to chords only - theres no guidance or explanation on how to add or edit pre-existing chords - I tried to add a Bb Major chord And now I cant access the original chords!! Frustrating.

G4m3r1 about Tab Builder, v1.3.2