Omit Needless Words

To switch between irssi windows (normally alt+1 etc.) - use; Press Esc, let go - then press number, 1, 2 whatever

To pageup/pagedown - use this keyboard sequence (must be in this order)

Press (and hold) Shift-key, now Press and hold fn-key, now with these keys pressed (in that order) - press the pageup (arrow up) or pagedown (arrow down) keys to pageup/down

If your backspace key is acting as a ‘delete’-key in irssi in screen, Hit command+I, in terminal to bring up your window preferences, under the Keyboard settings, tick ‘Delete key sends backspace’ - that should fix that.

Credit: “Matt,” via Rev Fry