How do I set up the CPUs from AWS console for my EC2 instance?

I would screenshot you the steps by my AWS expired (I primarily use Azure).

Here is the steps though
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-resize.html

So am I right in thinking that you don't actually select the number of CPUs but rather the instance type which has CPUs assigned to it?

Yes that's correct.

OK I managed to get to the listing of instances and can see that I have t2.2xlarge which equates to the 8 CPUs.

However I can't see a Change Instance Type but instead there is an Actions button at the top and then nearest I have is:

Actions > Instance Settings > Change T2 Unlimited

Could this be it?

Also it looks like I have maxed out on the T2 model. Does this mean if I wanted more CPUs I will need to select an instance other than T2 such as M5?

In order to power off, do I need to change the Instance State to Off?