Here's what i believe to be the error log:

Uncaught exception from thread:Thread[LWJGL Renderer Thread,5,main]
java.lang.UnsupportedOperationException: GLSL and OpenGL2 is required for the LWJGL renderer!
   at com.jme3.renderer.lwjgl.LwjglRenderer.initialize(LwjglRenderer.java:166)
   at com.jme3.system.lwjgl.LwjglContext.initContextFirstTime(LwjglContext.java:131)
   at com.jme3.system.lwjgl.LwjglContext.internalCreate(LwjglContext.java:168)
   at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:128)
   at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:205)
   at java.lang.Thread.run(Unknown Source)
Application was not initialized.

Yea i tried that but i get this error message as soon as i press the icon:

Java virtual machine launcher
Could not find the main class:mythruna.client.Mainstart. Program will exit

So i just downloaded the game and i get the startup screen to pick the settings so i just pick what's already there. After that a black screen pops up for less then a second then closes. Could somebody please help ? Also, i don't use computers much so try and explain it as simply as possible. Thanks