Your donation page shows a One-time and a Monthly option at the top. A donor who picks monthly sets up a recurring gift that repeats automatically each month. If you set up donation tiers, choosing a tier automatically switches the donation to monthly.

Turn on Allow donors to donate anonymously in Settings, then Donations. Once it's on, donors see a "Don't display my name publicly" option, and they appear as "Anonymous donor" on any public pages.

Anonymous only hides the donor from the public. You and your team always see the donor's real name and details, even for anonymous gifts, and even if your organization is in transparency mode.