How do I unselect 'Encrypt iPhone Backup' in iTunes so I can jailbreak my phone.

Tried to jailbreak with Evasion on my iphone 5 and was told by the install that I needed to remove backup passwords in iTunes. I know what my password is. I can change my password. But it wont let me unselect the box. Now what do I do so I may continue with the jailbreak.

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