"Where do I find Statement A?"
That would be qualified business income (QBI) pass-through reporting (Section 199A).
Basically, you should have received a supplemental statement along with your K-1 (or some sort of instructions) to guide you on how to report the figure on your K-1 on your personal income tax return.
If you did not receive any such statement or instructions, you should contact the responsible party (i.e., the party who is responsible for preparing the entity's income tax return).
