There is a whole chapter on forms, as I recall.
You create an HTML page with a form in it identified by <FORM>...</FORM>.
In the <FORM> tag you specify the name of the page to be called when the form is submitted, e.g.
<FORM METHOD="POST" ACTION="anotherpage.asp"
The fields within the form are defined using the <INPUT> tag, e.g.
<INPUT TYPE="TEXT" NAME="field1">
The fields within the form are available to the called ASP script like this: Request.Form("field1")
I don't have a full example to hand, but you should be able to find the reference in your book now, I hope!