Ask install owncloud at centos 7 [Urgent]

Hello can all help me? I already install using tutorial https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-owncloud-on-centos-7

and finish install LAMP

Problem

why

Can't write into config directory!

This can usually be fixed by <a href="https://doc.owncloud.org/server/9.1/go.php?to=admin-dir_permissions" target="_blank" rel="noreferrer">giving the webserver write access to the config directory</a>.

I do no how to fix this

Please help me

Me using google cloud

Looks to me like you should follow that link in the message.