Sorry for a dumb question, but I'd like to upgrade from
9.0.5 ==> to 9.0.10 Too many bugs in my original version.

What is the process, or a link to instructions on how to
do this?

Will it affect the posts on the site currently and will it
affect subscribers login settings,, etc?

Can I delete the old sofware from the site and just
upload the new version?

Thanks,
Ron