
sich anmelden
to register
To register or sign up for something in order to participate or gain access, for example for a course, an event, or a website.
Ich möchte mich für den Töpferkurs anmelden.
I would like to register for the pottery course.
to register / log in
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to register
To register or sign up for something in order to participate or gain access, for example for a course, an event, or a website.
Ich möchte mich für den Töpferkurs anmelden.
I would like to register for the pottery course.

to log in
To identify oneself to a computer system, application, or website with a username and password in order to gain access.
Du musst dich zuerst mit deinem Passwort anmelden, um deine E-Mails zu lesen.
You have to log in with your password first in order to read your emails.

to register
To have something or someone officially registered with an authority or institution.
Nach dem Umzug müssen Sie Ihren neuen Wohnsitz beim Bürgeramt anmelden.
After moving, you must register your new place of residence with the citizens' office.

to announce
To announce or give notice of something in advance, for example a visit, a claim, or a need.
Haben Sie Ihren Besuch bei der Sekretärin angemeldet?
Did you announce your visit to the secretary?
'Anmelden' (to register / log in) is a separable verb. The prefix 'an-' comes at the end in main clauses. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Ich melde mich morgen für den Kurs an.
I will register for the course tomorrow.
Pay attention to the difference: 'sich anmelden' (to register oneself / sign up) means to register yourself for something. 'Etwas anmelden' (to register something) means to officially register an object or another person.
Sie meldet sich für die Prüfung an.
She is registering for the exam.
When registering for an activity, you use the preposition 'für' followed by the accusative.
Hast du dich schon für den Newsletter angemeldet?
Have you already signed up for the newsletter?
In a digital context, you usually use 'sich bei' anmelden (e.g. with a website/account) or 'sich in' anmelden (e.g. into an account).
Melden Sie sich bei Ihrem Konto an, um fortzufahren.
Log in to your account to continue.
This meaning is often used for official procedures with authorities. Typical examples are: 'einen Wohnsitz anmelden' (to register a place of residence), 'ein Gewerbe anmelden' (to register a business), or 'ein Auto anmelden' (to register a car).
Wer umzieht, muss seinen neuen Wohnsitz innerhalb von zwei Wochen anmelden.
Anyone who moves must register their new place of residence within two weeks.
to allow / admit / keep closed
In an official process, zulassen and anmelden can both occur, but they refer to different steps. Anmelden means registering something with an authority or initiating the process; zulassen emphasizes the subsequent review and official authorization. Use anmelden for the registration and zulassen for the approval.

Ich melde das Fahrzeug heute bei der Behörde an.
I am registering the vehicle with the authority today.
Die Behörde lässt das Fahrzeug nach der Prüfung für den Straßenverkehr zu.
After inspecting the vehicle, the authority approves it for road use.