There is not enough information in your question to give a totally helpful answer. First one needs to verify if Embedded Coder is licensed with the MATLAB / Simulink license you use. In case it is, you need installation information from your IT / MATLAB administrator. If Embedded Coder does not show up, contact installation support. In case you get an error message, search for it in MATLAB Answers and in case you need it, call installation support.