Invictus

Hey everyone, I’m just starting my website today, and setting it up.
my theme is ‘Invictus’ and i’m aiming to make a simple yet professional looking Photography Website… I was looking at the live view of ‘Invictus’ and the menu up top looked very good and interactive… But once I installed the theme, the menu just has a little tab labeled ‘pages’ and then drops down with all my pages… not looking NEAR as professional as the live view of ‘Invictus’ did… Does anyone know how to fix this? The help document has a section about it, and i’ve done everything it says up until the video it says to watch.. But then it turns out to be a 404 error unknown page… I’m super stuck…