The idea is that you provide money, and the bank manages it in investments compliant with the formula, with profits distributed according to agreed-upon ratios and rules.
Steps
This is different from simply promising a fixed return on your investment.
Before opening an account, ask: How is the profit calculated?
How often is it distributed?
And is the advertised figure historical, projected, or a fixed commitment?
The figures, fees and limits in this answer vary by bank and change over time — confirm them with your bank or the official source before acting.