How do I save the machine set-up values, or is there any type of short cut? Also I would like to know about "Arduino & gShield? Any help will be appreciated.
If you go through the X carve set up procedure, those grbl settings will be saved. To access them you type $$ in the Easel Console window after clicking Machine/Advanced/Machine Inspector…when logged into easel.
If you are using UGS, then you type $$ into the command window and the list of GRBL settings will come up.
If you want to change a setting you can see my response in this thread.