The .otf that came off the press is a normal font file — the same format the professionals ship. Here is where it goes on each machine, plainly, including the places it honestly can't. Two clicks on a computer; phones are fussier.
where installing is genuinely the easy part
Windows: right-click the .otf → Install. Or double-click it and press the Install button on the preview. Done — it's in Word, Photoshop, everything. Apps already running need a restart to notice the new arrival.
macOS: double-click the .otf and Font Book opens with one big Install button. If Font Book offers to validate first, let it — a font pressed from your own hand passes. It appears under the name you gave it, filed alphabetically between the fonts that cost money.
Linux: copy the file into ~/.local/share/fonts/ and run fc-cache -f — or just double-click it in most desktop environments and press Install there too.
possible, with one detour
iPhone and iPad take fonts through a font-installer app: several free ones on the App Store wrap your .otf in a configuration profile, you approve it in Settings, and the font appears in Pages, Keynote, and other apps that read installed fonts. Android has no polite system-wide route — but apps with their own font import take the file directly, and everything else can be reached the dependable way: make the document on a computer and send a PDF, which carries the letters inside it.
limits worth knowing before you blame the font
the two-minute checklist
No font to install yet? The whole ceremony — draw, proof, press — starts at the press, and takes about fifteen minutes. Collecting someone else's hand first? The worksheet is the paper half of that.