How to use ssSetSFcnParamTunable or configure via menu

I am building with real-time workshop I got "signal is a floating point type. Consider changing the data type or selecting the 'support floating point numbers' option on the Configuration Parameters > Real-Time Workshop > Interface page"

I saw some ideas to use ssSetSFcnParamTunable(S, 0, SS_PRM_NOT_TUNABLE); to solve this issue.

I have to questions: 1) how to use the ssSetSFcnParamTunable 2) is it possible to use simulink window/menu to configure instead of using a C code?