... this means I cannot change the given headline? In this case "editing Sandpox 2" ... or is it just here, because it's a sandbox?

Headline I

does the headline-ranking start newly in each page?

Headline II

... looks quite like it ...

Question:

How do I enter a new Subject/Page under the (Hydro) starting-page?

I dought to find out about within such sandbox tool ... hm ..

lets search on ..

==> guess thats the way to do it: