ok, some further questions then
when you say bigger, what do you actually mean? In your OP you stated A5, so the page is sized accordingly and the table pushed out about as far as it can go (there are limits on margins that imposed by individual printers)
do you want the table at A5 size, or is there some other measure here?
also, it might be useful to know what version of word you're using.
There are several ways to approach the running a macro, simplest way is probably to press ALT-F11 to open the editor. Put your cursor anywhere in the text and press F5. Of course you probably wont see anything cos the tables already been processed, but we need to answer the layout questions before we worry too much about this part