With all manufacturers feed schedule, start off at half strength, then add 1/4 strength until you get the EC/PPM you need. Generally 3/4 strength is a safe bet.
The Blue Dragon will stretch for ~20 days before first flower set begins. So follow the second line in Grow for stretch, then for week 3 go to next line, etc...
Edit: the jpg is too small to see the numbers, but if you google Canna Feeding Schedule you will find it.