Need to change activity monitor logs

We would like to change activity monitor logs on Linux master running 7.1.0.4.

I know we need to change these:

KEEP_JOBS_HOURS = hours

KEEP_JOBS_SUCCESSFUL_HOURS = hours

But, I have seen several ways to do this either by editing the bp.conf or using bpgetconfig command.  I assume we need to bounce NBU services as well.  Need to know proper way and steps:  Also, are there spaces between HOURS = hours?

Thanks