Yunohost has an administrator web interface. The other way to administer your Yunohost install is through the CLI called "moulinette"
Please note that the web interface is an active work-in-progress and has far fewer features than the CLI moulinette.
You can access your administrator web interface at this address: https://example.org/yunohost/admin (replace 'example.org' with your own domain name)
To reset YunoHost admin password (Need a root user available)
add the following lines to /etc/slapd/slapd.conf
:
rootdn "cn=admin,dc=yunohost,dc=org"
rootpw {SSHA}O4kkm2OkgO2DPrrnYXXXXXXXXXXXXXXX
where the hash in the last line comes from (or at least that's my understanding)
slappasswd -h {SSHA}
# A password will be ask, and you'll get the corresponding hash
Once the lines are added, [here you might need to restart the ldap service ?], you should be able to connect to the admin interface, rechange the password properly, remove the lines you added in slapd.conf, and that should be all.
Sample with WordPress:
# Move wordpress folder to an external hard drive
$ sudo mv /var/www/wordpress /media/externalharddrive
# Symbolic link
$ sudo ln -s /media/externalharddrive/wordpress /var/www/wordpress
# Folder must belong to www-data
$ sudo chown -R www-data:www-data /media/externalharddrive/wordpress