Hey Bren,
the three items you’ve listed are all controlled via the “functions.php” file, I can point you or your programmer to the places where the necessary code is located.
Regarding your second question: portfolio items on the blog posts page haven’t been envisaged by Ikebana’s design (just as the blog posts in the portfolio grid), so it is not possible to display the portfolio items in the blog without either customizing the “index.php” file or (a more recommended solution) creating a new custom template file based on the “index.php” with a custom WP_Query that would include both blog posts and portfolio items.
Sincerely,
Andrii / Satori Studio