Press 'F1' or Ctrl+Shift+P to access one of the commands.
You can access all functionality (besides opening the journal) from the smart input.
journal:day
(keybindings:ctrl+shift+j
orcmd+shift+j
on mac) opens the smart input, seejournal:today
for opening today's entryjournal:tomorrow
journal:note
opens a dialog to enter the title of a new page for notes.
journal:open
starts a new instance of vscode with the base directory of your journal as root