Since you are using Linux on Edison, you need to place it in ~/.Mathematica/Application, which is in your home directory.
There are equivalent download instructions at
which might clarify this.
By the way, I have installed NX,which is a computer program that handles remote X Window System connections to run Methematica. And I tried directly load SimulationTools (maybe there is SimulationTools already installed in Edison, or maybe I can load SimulationTools even it is located in my home directory) like below:
<螢幕快照 2018-02-10 下午2.03.30.png>
It failed, so SimulationTools seems to be required to move to Application directory of Mathematica.
Yes, that should fix the problem.
NX is good; that should be fast enough to use Mathematica remotely.
Good luck, and please keep asking questions if you need help!