make sure the .c file is in anope/src/modules
then on command line
cd pathto/anope-1.8.5/
make modules
make install
then navigate to anope(version)/services , services.conf
edit
scroll down to
ModuleDelayedAutoload [OPTIONAL]
and add the module name there so it auto loads (if you wish). save and close, then as root on your server.. type /os restart
services will then restart. type /os modlist to view
or... you can bypass that step and go directly to the server. and as root type /os modload modulename
if all goes well you will see it load correctly, otherwise it will show an error.
hope that helps.. i'm not too clever at describing things so hope it makes sense