Flagstaff table

I put this in tips and tricks because there has to be a trick to this.

My TT has a table and four chairs. The table has an extension but for the life of me, I can not figure out how to extend it. I have been under it, my friend has been under it and we can not find the mechanism to unlock it to slide out. Anybody - please help with this crazy table. I know it is going to be easy peasy bit I CANNOT find it.