Hey Autumn,
The size of the photos is related to how many columns you select to display. So if you display 1 or 2 columns then the photos can be very big, but if you select 8-10 columns then the photos are displayed smaller as they need to fit into more columns. Setting the plugin to display fewer columns will allow the images to display larger for you.
It looks like the responsive layout isn’t working correctly as your theme has the following CSS on line 68 of it’s responsive.css file:
#footer-logo img {
max-width: 726px;
height: auto;
}
If you add the following CSS to your theme then it will override that and allow the plugin’s responsive layout to work correctly:
#footer-logo #sb_instagram img {
max-width: 100%;
}
If you don’t know how to add that to your theme, then I’m going to update the plugin today to include a ‘Custom CSS’ field where you can input custom CSS like this directly.
Let me know whether that helps,
John