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I think this link gives you the results you want:

http://xenforo.com/community/search/search/?type=post&users=Jake Bunce&group_discussion=1

This link can be added to the navbar with a template edit.  The username can be a variable so it turns into the name of the current logged in user.  If you need help with this then I need you to enter your forum name (razon.05) on this page so I know you are licensed:

http://xenforo.com/customers/forum-users