permession in Exchange 2007

i have a permession i want to enable for a mailbox in my exchange server 2007
i attaching a screen shot of the problem
can som1 tell my how can i enable this permession ?
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AkhaterConnect With a Mentor Commented:
add-mailboxpermission -identity usermailbox -user 'user to assing rights to' -extendedrights fullaccess
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