I have a Happy Hacking keyboard and there are legends on the side of the keys for all of the buttons on a normal TKL keyboard: delete, home, end, page up, page down, etc. So just hold an Fn key, and press one of those keys.
Actually this layout is better than the latest HHKB layout that I see. Here, we have room for an Fn key reachable by either pinky finger, necessary similar to having shift keys on either side, but HHKB got rid of the Fn key on the bottom left next to alt, so hitting functions on the right side of that keyboard requires a dexterous dance of the right hand.