Easy easy english writting question.

When is the proper time to use the ;? I use it sometimes but I doubt I’m using it properly.

It is called a semicolon. You use it to separate clauses that could stand independently of each other, but you want to relate them closer than two sentences. They can also be used to separate a series of clauses.
The rule of law is sublime; the rule of men is slime.
There are three important rules of grandma: wipe your feet before you come in; keep your feet off the furniture; and don’t his your brother.

Cool in that case I guess I do use it properly.

Did anybody else notice the title of this thread?

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Better to use it to separate a series of clauses at least one of which contains a list separated by commas:

There are three important rules of grandma: wipe your feet before you come in; keep your feet off the bed, couch, and kitchen table; and don’t hit your brother.

Because this is a thread specifically asking for grammar help, I will provide the following assistance:

Cool; in that case, I guess I do use it properly.

An argument could be made for omitting the comma after “in that case”, but I like it there.