Make sure your site is connected to the concrete5 community. Open the right side panel and click 'Extend concrete5', then click 'Get More Themes'. In the search area type ‘Dio’ and click 'Search', click on the add-on title or image to view details, then click 'Purchase'. Once downloaded and installed click 'Ok'.
Click ‘Pages & Themes’, then click ‘Activate’.
Logo size & Navigation: There is no restriction on size of logo within reason and the header navigation bar will automatically centralise itself depending on logo height.
There are three templates for site navigation. The main nav at top of the site, a vertical nav in sidebar of 'About' page and 'breadcrumb' trail at top of all pages. The main nav is NOT directly editable, however links to pages will automatically appear or disappear depending on which pages you want to be visible.
Retina set up:
When using any image if you want to accommodate retina displays, make dimensions 50% less than actual size in the 'File Manager'.
When in 'Edit Mode' a dashed border appears around existing blocks for ease of viewing.
Qucik guide to changing colours and page templates: Designing