How to install new toolbox in existing MATLAB?

Dear MATLAB Community,

I am trying to install new Matlab's symbolic math toolbox, as I need the ilaplace function. I am using the student version 2014a. I run the zip installer, downloaded and installed the new toolbox. However, I still could not run the ilaplace function from Matlab. I checked the installation directory and ilaplace is in the installation at MATLAB\R2014a\toolbox\symbolic\symbolic\@sym and MATLAB\R2014a\toolbox\symbolic\symbolic\@sym\ja. But still I cannot access this function from Matlab command.

Is there something I missed?

Thank you.

Regards, Tan

[per isakson]

Is the symbolic folder in the search path?

[Tan Biru]

No, but do I need to add it manually? Thanks.