You just need to create a File type variable in NeoLoad pointing your CSV file. Then configure it for example with a change policy of "on each iteration" Global/Sequential so each virtual user uses a new search value on each iteration.

In the Design section replace your recorded search value by your File variable name. You can use the NeoLoad picker or directly write ${MyFile_Variable_name}.

To complete Nouredine's answer, the syntax is ${myVariableName.columnName}