If you find a character in a text, you use FIND() formula.

In the paranthesis of FIND() formula, first you write the character in " " or the cell name your character is written.

After, you write the cell name of where the text is written.

Lastly, you  write a start number which describes the order of the character you start to search.

 If you don't write a start number, default value will be 1.

FIND() formula has case sensitivity.

The result will be the order of the character in text.