The Davfs article on ArchWiki is well explained:
Add yourself to the network group:
# usermod -a -G network <user>
Restart your session, and add the following entry in
https://owncloud.yourserver.com/remote.php/webdav/ /home/<user>/Owncloud davfs user,noauto,uid=,file_mode=600,dir_mode=700 0 1
~/.davfs/secrets and add your credentials like this:
"https://owncloud.yourserver.com/remote.php/webdav/" "webdavuser" "webdavpassword"
Note that the double quotes are not required, but if your password contains special characters, it may help.
Now you should be able to mount and unmount
$ mount ~/Owncloud
$ fusermount -u ~/Owncloud