Security Message

Same answer as in [1] also applies here:

i think it might help more if you explain what steps you did and what issues you're still facing. The only pointers currently which can be given here is the documentation, providing all needed info to solve this message (see below).

So have a look at the documentation and work your way through it. I think the people in here are happy to answer any specific questions you have when doing so.

Documentations on this messages are linked below at [2]

[1]

[2] https://doc.owncloud.org/server/latest/admin_manual/configuration_server/security_setup_warnings.html