all manuals for routers are free
all manuals are on line, all are. for sure under 10 years old or even older most.
yours is 2005 made a real relic now. 13 years old for you
and now 17 years old.
no 2 routers work the same why (settings or features all)
you did the long reset (at button) so the router is now back to day1, new in the box state
so only cure is the manual
now I will google it for you, 10 sec work
the manual is at MSI.com but is slow to navigate there,so I am lazy here is the echo of it, 182 pages deep., shocking yes but routing is complex. but basic setup is not hard.
at IP address
see page 10 first, how to access the build in setting page of the router.
on PC uses chrome to access it or firefox v95 up
do not use IE1 to 11, as it has problems now.
click OK to any security certificate error do to 17 year age.