Active Server Page Surprise

Now it's my turn for what may be a really stupid question.

I've been asked to do a search engine optimization for a simple commercial
Web site. When I began to download the source pages, I noticed an asp
instead of an html extension.

Although I have a firm understanding of HTML, and comfortably code my sites
by hand, I have not even the slightest experience with active server pages,
and I don't know what I even need to ask, so "please pardon my French..."

Can I change page titles, add the desired meta tags and just upload the
amended source pages to the server without goofing up the whole works?

Thanks so much,
Lauren

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