Can't input value or write in IDE?

Is Any one know what the issue, i can’t write or input any value in the IDE…So i can’t lever my 3D printer.

i just brought a Anycubic 3d Delta Printer, follow the giving link which say download using Arduino 1.6.4
But i can’t write any value on this program…it show…java. lang.InternalError: Text component read only??..i also did update the latest Java & restart my PC…it still can’t input value…

Is anyone can help?

i using window7

Go to the IDE setting and uncheck “use external editor”