Dear Hassan,
Sorry, my mistake, many thread in one time.
Could you provide me some info?
1. Screenshot from edit group page. Opened checkbox field.
2. Copy text from checkbox custom field. Edit post->custom fields->checkbox.
(if you not see custom fields box, activate it manually : Top/Right button Screen options -> Custom Fields)
Please let me know if you are satisfied with my answer and if I can help you with any other questions you might have.
Regards,
Gen.