LaTeX.org

Stefan, thank you.

On the Ask a question page it says
Tags:
End each tag by RETURN key (ENTER). Allowed tags: -, 0-9, a-z, A-Z, spaces (will be converted to -), min: 3, max: 30

But there is no panel to type tags into!

I have 4.27 on a MacBook with MacOS 10.14.4, Mojave.
In TeXShop I often use find/replace with a regular expression.
But the "More Options" panel is completely inoperative and always has been, for about 4 years which is when I first noticed.
Search Options "Single line" vs "Multiline": it doesn't ...