gnu screen

I am using GNU Screen software application to multiplex several virtual consoles. I can access multiple separate terminal sessions inside a single terminal window over remote ssh terminal session. Often I need to go though server logs located in /var/ directory. I can not seem to scroll up when I run tail -f /var/log/messages or /var/log/secure file. How do I use page-up / page-down keys to scroll up under GNU scree?

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