Help making project info field(s) visible in layout?

Haven’t been on here for a while. Another newbie question. Can someone show me a safe way to add a field below the composer filed “Transcribed/Manny Mendelson”? I seem to recall it’s pretty dangerous to change page setups. I tried to enter it into the Arranger field but nothing appeared in the layout. Any simple instructions would be helpful. Please assume newbie level. . Also, what would be the relevant “Help” topic(s) I should read to make some of the Project Info fields (such s arranger) appear in the layout? As always, Sincere Thanks!
Remanso Transcription 05112024.dorico (1.5 MB)

You edit the Page Template so that it includes the Arranger field…
Remanso Transcription 05112024-edit.dorico (1.3 MB)
(The old tutorials are still useful though the terminology changed, which is confusing)

Much appreciated. If anyone can add a “step by step” for this I would appreciate