That's just the trick. Salt to taste is different depending on what you like and who you're feeding. When it says that, it literally means that. You may have to experiment with how much salt you add, but go easy at first. You can always add more, but you can't take it out once it goes in, and too salty is ACK not to mention health problems some people have with salt.

Remember this: a dish will not always be right the first time you make it. It's not always you that makes the error. Some recipes just plain aren't workable without modifications. If you're thinking about making a dish for company, make a test run first. Make sure that the recipe is actually any good :)