Ethel, I have the same problem as the OP. I have recently started using a laptop, and the type on AB is so small that I find I'm making mistakes I don't notice before submitting my post.
I can get the type bigger on my desktop - it's the type in the AB pages that I am struggling with - the type that you are reading now.
You can use Firefox 3 (a free browser), to browse the internet instead of Internet Explorer.
It has many, many advantages. But importantly here, it remembers the text zoom size for each individual website, so the next time you visit that site, the page is already at a suitable size.