Y2 GPaS Test: Coordinating or subordinating conjunction?

In each of the following sentences a conjunction is highlighted. Is it a coordinating conjunction or a subordinating conjunction?

Englicious is totally free for everyone to use!

But in exchange, we ask that you register for an account on our site.

If you’ve already registered, you can log in straight away.

Since this is your first visit today, you can see this page by clicking the button below.