Install the add-on packages Docker Discourse (https://www.synology.com/en-us/dsm/app_packages/Docker-Discourse) for Synology DSM 5.2 (https://www.synology.com/en-us/dsm/5.2).
Having problems with the activation of the account administrator.
Does the DSM provide a local mail service or did you configure it to use a remote mail server. Discourse needs mail to setup.
That said you can cheat. Look around meta for how to access the rails console of the dockerized rails app. Once you have done that look for how to manually activate the admin account. There are write ups on doing both.