Error

When i try to upload the test "blink" an error message pops up and says, "error uploading, check if the selected board is currently available."

Hi @LexiRobinson,
what do you have in the boards dropdown? Can I see a screenshot?
Thanks

Screenshot

According to the screenshot, you're trying to upload the sketch on Arduino Mega, but Arduino Mega is not connected to your computer (red "x" icon near to the board name)

But it is, and that's the issue

Can you please send a screenshot of the dropdown open? Thanks

Here you go

Have you installed the plugin / followed the getting started? No board is detected by the web IDE in your computer. The boards connected are automatically listed as in the screenshot attached.

boards_connected.png

You must say YES to the certificate, drivers and firewall permissions during the install process.
Otherwise CREATE will not work.

By any chance are you using USB 3.0 ports ?

If so swap to a USB 2.0

You might also want to turn off any antivirus or similar just to test.

The port I don't know. But i have downloaded everything

Looks like you need to google the difference between USB 1.0, 2.0, and 3.0 and how to identify them on a computer.