In Terminal, use:

• Shift + Fn Up for PageUp
• Shift + Fn Down for PageDown
• Shift + Fn Left for Home
• Shift + Fn Right for End

That’s simple. Works for all cases l know: screen, tmux, mutt, vim, irssi, less, man pages, …
Bonus: the tilde ~ symbol can be done with “Shift + Alt n” !