Settings

Five tabs, in the classic order. Every change is saved with the button at the top; the ones that concern where the panel listens take effect at the next restart, and the page says so.

General

Setting
Panel listen / port / URL path	where the panel answers — changing the port or path moves the panel at the next restart; note the new address before you restart
Panel domain, certificate, key	what the panel serves TLS with; the installer fills these
Session length	how long a sign-in lasts
Page size	rows per page in the tables
Time zone, language	for dates and the interface
Defaults for new customers	quota, days, device limit, reset cycle
Backups	schedule, how many to keep, whether to send each to Telegram
Trusted proxies	CIDRs allowed to set X-Forwarded-*
Collection interval, online window	how often usage is read, how long since a handshake counts as online

Security

Username and password, two-factor authentication (TOTP — scan with any authenticator, confirm a code, keep the recovery key), sign-in notifications to Telegram, and the security warnings the panel raises (plain HTTP, a default path, a weak session length).

Telegram

Enable the bot, the token from @BotFather, the admin chat id(s), the bot's language, and which events notify: customers depleting, expiring, sharing detected, backups, sign-ins, a daily report. The interactive bot is covered on its own page: Telegram bot.

Email

SMTP host, port, encryption, sender, and the same notifications by mail for an operator who does not use Telegram.

Subscription

Enable the service, its listen address, port and certificate (a listener of its own, or the panel's), the public domain and path, the reverse-proxy URI when it sits behind one, whether text subscriptions are base64-encoded, the update interval clients are told, the profile title, support and profile URLs, an announcement, and the template — six looks for the customer page, with a one-time preview link. See Subscription page.