To solve a problem, choose one of the operations on the left sidebar, that is one of Simplify, Factor, Derive, Integrate, or Find 0's.

Type the math expression into the input field. You can either press the enter key on your keyboard, or click the button under the input field to get the result.

Note that if the expression is not well-formed, you might get an error Error: Equation is not well-formed. However, since Casual Math takes advantage of symbolic parsing, an expression like abcd+efgh is still considered well-formed, so you might still get a result.