I'm trying to add two columns to the the chart at this link:

http://lpi.oregonstate.edu/infocente...als/magnesium/

(the one that says "Recommended Dietary Allowance (RDA) for Magnesium") so I can add more information to it for a project I'm doing. I copied and pasted the chart onto the Word document, but how do I add these two columns once I have it there?