If you know the persons IM name then you add them to your friends list. Sometimes you have to close trillian and reopen it for the Unblock feature to appear when you right click on their name. It will be under privacy in the right click menu.
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How to unblock someone on Instagram: On your Instagram profile, tap the menu button in the top-right corner (three lines). Go to 'Settings'. Under 'Privacy and Security,' select 'Blocked Accounts'. Click on the account you wish to unblock and select 'Unblock'.
You can't. Not until they unblock you.
You cant
yes
Get his phone and unblock it (: