This will mostly be visuals because I'm bad with words :D

1. The Difference between the "Edit Profile" button and the "Customize profile button."

Using the purple "Edit Profile" button isn't CSS. It'll remove features and mess it up.

2. Where to edit.
After clicking the right button, this thing should pop up.

This is where you paste and edit the CSS.

"Ohh but its too much work to customize anything!" - Then why use a template?

This is where you edit the filler sections, change the colors, etc.

Important features you should take into account.

1. Make your card profile background clear.

2. Make the text white.

3. And make sure you have no effects enabled.

And that's it! Enjoy!

Do you want a more in-depth guide?

Click here for a how to find class IDs guide!

Click here for a fuller visual guide!

Also some cool description class IDs here.