Can't figure out how to put calls on hold!

[hibiscus]

Maybe I'm really dim, but for the life of me I can't see how to put calls on hold. If I receive a call while I'm talking on the phone it puts the first call on hold and I can talk to the second caller. But if I hang up on the second caller it hangs up on both. The owner's manual refers to a 'swap' button, but I don't see this. The manual also explains how to do a 3-way call, but I don't have the option for this in the menu either.

What could I possibly be doing wrong?