You are talking about the following commands, right?
sudo ln -s /etc/lego/certificates/DOMAIN.key /opt/bitnami/apache2/conf/server.key
sudo ln -s /etc/lego/certificates/DOMAIN.crt /opt/bitnami/apache2/conf/server.crt
sudo chown root:root /opt/bitnami/apache2/conf/server*
sudo chmod 600 /opt/bitnami/apache2/conf/server*
Please note that it's not "1n" (with the number one), it's "ln" (letter 'el'). Please substitute DOMAIN with your domain before running those commands.