Please stick to one topic per thread, folks (see the Survival Guide, linked in my signature below). That way, people looking for information can find the right topic... and people reading this thread and expecting a discussion on faxing and templates would not be frustrated by the off-topic conversation about combining documents, which belongs in the main Writer forum. (And you don't necessarily have to insert a page, you'll automatically get a new page when you just paste the document b content at the end of document a. Insert a page break only if you need document b to start on a new page when it doesn't after you paste it.)
Anyway, back to the fax wizard...
This is what I see when I choose File> Wizards> Fax, in 2.3.1 on WinXP. I've circled all the page design options, just for fun.

(Well, the one on the left isn't really an option, it's just a list step.)
Is this not what you get?
Also, you need to please include the exact version of OpenOffice you're using (also per the Survival Guide). 2.3, for example, isn't good enough, because the x.x.1 issues are bug fixes, so we need to know which release of 2.3 (not 3.2

) you have.