Put your name on it
A good post gets screenshotted, reposted, and shared well past the account that made it. That's the whole point — but it also means the post should say whose it is, without you stamping a logo on every single export by hand.
Set it once
Your brand kit lives in Settings → Brand: a display name, a handle, an optional logo, and an accent color. Save it once and it's done — you're not re-entering it per post.
It shows up quietly, everywhere
Once your kit is set, exports carry your watermark automatically — no per-post toggle to remember. If you'd rather not have one at all, or want a plain CutePost mark instead of your own, that's a setting too, not a trade-off you're locked into.
Why bother
Templates are meant to be shared past their original context — that's the format doing its job. A watermark is what makes sure that when a card resurfaces three shares later with no context attached, it still points back to you.