the barrier setting procedure is in the operation manual.
programming with IGF doesn't mean your tools will crash, or not crash. if you set the work zero correctly and program it correctly then the tool shouldn't be anywhere near the center.
setting the safety barrier can help to save your center, but the correct thing to do is learn how to use the machine properly and how to program it correctly.
if you have the barrier set and the tool tries to hit the center it will save it, but the machine will not be making parts so you will still be no-where.
reading the operation and programming manuals in full and learning proper operation including running in single block with slow rapid for the 1st part will get you further.