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I asked one professor to write a letter for me and he agreed. I inputted his information and printed the form.
But now something came up and he could not write it. I have two recommenders besides him. So I said ok to him and went to delete his information. But I found that I could not do that.
Will I be able to delete? If not, will this affect my application?

You can't delete. It's no big deal though since LSAC will only send the recommendations you ask them to.

If it really bugs you that much just send an email to LSAC and they can do it for you.

Thank you for in the input.
It is a relief to know that. ^_^