creating a url for page

On the page editor, over at the right side, look for the “slug” field.

do you mean post slug?

do i just enter the url there

i.e. https://www.blah.com/blah

Yes, that’s what I mean. And no, you don’t put a full url there.

If you want the page to be https://www.mydomain.com/blah/ (assuming your blog is installed at https://www.mydomain.com, of course) the “blah” is what goes in the slug.