Primary & Foreign Keys in pgAdmin

I was wondering can some give me an explanation on how to assign primary and
foreign keys in pgAdmin?

I can't find any information online.

For example...I've got a Student table with all their details (address,
d.o.b. and etc.). I'm going to add a student_number to the table and make it
a primary key.

I just want to know how do I do that using pgAdmin? And if you may be kind
to explain give me further information on using Primary Keys in postgreSQL
(and pgAdmin). The same case with the foreign keys.

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