How do you share wiki pages?
The same as any other page: copy the URL from the browser. When someone pastes that URL into their browser (or clicks on an HTML link you've made), the lineup will appear for them just as it appeared for you.
It's considered friendly to give readers a lineup that provides appropriate context; that is, a sensible route to the interesting page.
However, you might want to give them just a single-page lineup. If the lineup is short, you can just throw away all the extra pages using the tools described in Next: Editing a Lineup, but you can also edit the URL before handing it on. (Click on Editing the URL if you think you might care.)
If your recipient does not have JavaScript turned on, see JavaScript-Free URL.