The Verdict: Not eligible
Your passport has no working holiday agreement with Poland, so there is nothing to apply for. To work in Poland, look at our skilled migration route; with Polish family, look at ancestry or diaspora.
The Aliens Act provides a national visa for a working holiday programme, but it only works where a treaty stands behind it. Poland's agreements are with New Zealand, Taiwan, Australia, Japan, Chile, South Korea, Argentina and Peru.
Canada is the common misunderstanding. Canada's International Experience Canada scheme lets Poles go to Canada; we found no arrangement bringing Canadians to Poland.
The ordinary way to spend a year working in Poland is a single residence and work permit with a Polish employer. Unlike a working holiday, that time counts towards settlement.