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.

'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 report / get in touch
'melden' and 'anmelden' can both mean that you communicate something to a person or office. The difference lies in the goal. 'sich melden' is often used when you get in touch or pass on information. 'sich anmelden' is used when you sign up, register, or want to gain access, for example to a course or on a website. With public authorities, the words can easily be confused: you can 'etwas melden', meaning report information, but you 'meldet sich' or 'meldet etwas an' when it is officially registered.

Morgen melde ich mich für den Deutschkurs an.
Tomorrow I am signing up for the German course.
Bitte melden Sie den Schaden sofort bei der Versicherung.
Please report the damage to the insurance company immediately.