To type mathematical statements in forums, use the [*tex] and [*/tex] tags to enclose your code. For fractions, use the format \frac{numerator}{denominator}, and for grouping terms, use curly braces. Symbols like π and γ are entered with a backslash, such as \pi and \gamma. When dealing with powers or subscripts that involve multiple terms, enclose them in brackets to ensure proper formatting. For a comprehensive understanding, refer to the LaTeX help page and explore existing code examples in the forum.