I'm happy to hear from you, but first, are you sure your website or application runs on Classic ASP?

The first giveaway that your website runs on classic asp is if the page addresses end in .asp. Note that not all Classic ASP websites do - this one doesn't for example - but if yours does then you have a Classic ASP website. So an url on your site might look like:

www.example.com/index.asp

Note that if your pages have .aspx suffixes, then your site is not a Classic ASP site, it's an ASP.net site, often known as dot.net. I can't help you with that.

If your pages don't have any suffixes then your site may still be a Classic ASP one. If you have access to the source code do you see anything looking like <% or %>? These are used to delimit sections of Classic ASP code.

Another way to tell if your site is built on Classic ASP is to look at the default cookie it sets. Visit a page on your site in your browser, right-click in an empty area and select Inspect from the context menu. In the Inspector find the info about Cookies. In the Chrome or Edge browsers it'll be under Application > Cookies, in Firefox it's Storage > Cookies. If there's a cookie there called something like ASPSESSIONDKJELSLKWD then it looks like your site is a Classic ASP one.

Are you getting an error message saying "An error occurred on the server when processing the URL. Please contact the system administrator."?  That probably means you have a Classic ASP website. That's often the default error message, but there are lots of other possible ones.