This is a total noob question, but how do I make my file a html file?

I built the splash page using notepad, and it is a text file. I tried simply renaming it, but it came out blah.html.txt

How do I make it so I can upload it correctly?

it seems as though all you did was rename the file, go to your folder options then select show file extensions, then go and change txt to html.

That will change the extension, i am not sure if it will operate correctly as an html if you do that, but it will change it

In order to rename the file to a .html extension you need to enabled file extensions in windows. This is done in folder options, there's a checkbox for "Hide file extensions for known file types". Uncheck that box and then you can change the extension.

But don't sweat it, you can upload the txt file to the splash page and it'll render it properly, without requiring you to rename it to .html.

Thank you so much