I need basic coding help

[IntoRain]

You don't need, you already have a site. x10hosting is another possible host where you could have made an account. The tutorial is for both x10hosting and 00webhost (which seems to be yours), that's why it mentions both.

To select all files inside, go inside the folder, click the first file and then scroll down and then click the last file while holding the shift key (left shift)