Apparently it is not being understood.. you do not use the arrow when installing the belt! The arrow has NOTHING to do with belt installation.
when installing the belt, you need to be using the hash marks (circled in red here) (1st set of images posted by Rampage)
Yes, that is exactly how it is supposed to be for INSTALLING the belt..
The ARROW is used for adjusting the valve lash, as described in the 2nd set of images posted by Rampage.
Installing a belt, and adjusting the valves are two completely separate procedures.. you need to follow the correct procedure for installing the belt, then move to the correct procedure for adjusting valve lash - they are not one and the same.