[irc]  /mode  [<channel>] [+|-]o|p|s|i|t|n|m|l|b|e|v|k [<arguments>]
              <nick> [+|-]i|s|w|o

change channel or user mode

channel modes:
  channel: channel name to modify (default is current one)
  o: give/take channel operator privileges
  p: private channel flag
  s: secret channel flag
  i: invite-only channel flag
  t: topic settable by channel operator only flag
  n: no messages to channel from clients on the outside
  m: moderated channel
  l: set the user limit to channel
  b: set a ban mask to keep users out
  e: set exception mask
  v: give/take the ability to speak on a moderated channel
  k: set a channel key (password)
user modes:
  nick: nick to modify
  i: mark a user as invisible
  s: mark a user for receive server notices
  w: user receives wallops
  o: operator flag

List of modes is not comprehensive, you should read documentation about your server to see all possible
modes.

Examples:
  protect topic on channel #weechat:
    /mode #weechat +t
  become invisible on server:
    /mode nick +i