The slash command
/set can be used to change various server options.
/set <option name> [value: <option value>]
option name is the name of the option you want to set.
In case of nested options, put a space between the parent and child
value is a required argument, which is the value you want to set
the option to.
To enable the bot:
/set enabled [value: True]
To set your Unity affiliate code:
/set unity affiliate_code [value: someAffiliateCode]