Hey Massakid,
I usually don’t like to refer the users to the theme manual as it may mean lower personalization of my answer, yet in this case I believe I will, to avoid repeating what is already there :) the process of creating a portfolio is described in detail on pages 6 and 7 of the manual, there are also screenshots of certain important aspects included.
By the way, in case you wish to make your website look like the theme demo, the fastest way to that would probably be importing the demo content I’ve included in the theme package – please see page 14 of the manual for details on how to import the content.
Sincerely,
Andrii / Satori Studio