How to edit menu's

I am so new to this and I’m sure this is a silly question. I recently began working on a page already in progress. I need to remove some menu buttons and I’m not sure how as I cannot find them ANYWHERE. The site is http://www.successconnection.org now, where I’m trying to work from….
-From the main page click “assessment categories”
-Now, on this page you will see a table on the right with free assesment categories. That entire table encluding the tabs corresponding with it is fine.
-Where my problem lies is with the buttons to the LEFT of it. I need to REMOVE THESE.

I can easily find access to the table no problem, but I’m usure of where to access those additional buttons.

Thanks in advance for walking me through this, and dealing with newbies such as myself 😉