Script Help Mobile Atlas Creator

I'm trying to use Mobile Atlas Creator to make some maps for my iOS devices.
The issue is that when I try running the script "start.sh"
It just opens up in the Text Edit app...
When I try running the code directly in the Terminal I get this response

java -Xms64m -Xmx1024M -jar Mobile_Atlas_Creator.jar
Unable to access jarfile Mobile_Atlas_Creator.jar​

The start.sh file gives this advice if it keeps opening in text edit:
"# If you see this file in an editor you may have to set the executable bit and execute it as script in a terminal"

I'm not sure how to set the executable bit but have tried renaming the file to "start.command" which makes it open in the terminal but it either tells me I don't have the permissions or just gives me the same output as running the java code in Terminal.

Any help would be awesome

 

Ran what you suggested and all I got back was the bellow:

Weston-Watersons-iMac:~ Weston$ chmod 755 /Applications/Mobile\ Atlas\ Creator\ 1.9.12/start.sh
Weston-Watersons-iMac:~ Weston$​

When I run the scrip in the start.sh file I get:

Weston-Watersons-iMac:~ Weston$ java -Xms64m -Xmx1024M -jar Mobile_Atlas_Creator.jar
Unable to access jarfile Mobile_Atlas_Creator.jar
Weston-Watersons-iMac:~ Weston$ ​

The stupid thing is that I can open the .Jar file directly... it just says it isn't giving it enough memory.