concrete5.4.2.2 and below:
By default, the logo area of OfficeSpace pulls back the Site Name from the Sitewide Settings section in your dashboard, unless the My_Site_Name global scrapbook block has been created - then it pulls whatever content is added in that block. If you want to add your own company logo, simply add it to the My_Site_Name block in Dashboard->Scrapbooks->Global Scrapbooks.
concrete5.5.0 and above with version 1.5.1 of theme:
If the stack Site Name isn't already created in your site, go to Dashboard->Stacks & Blocks and add a new stacked named Site Name. Then simply add a content or image block to that stack with your logo in it.
To setup the home page like the demo, first make sure you activated the 'Home' page type (go to Dashboard -> Pages & Themes and click the 'Inspect' button next to the theme. Then hit the Activate Files button if there are Page Types to be activated. Finally put the home page in edit mode and select the 'Home' page type. Then you'll be able to setup the home page like the demo.
To make a news page simply create a new page and name it News (or something like that). Then add a Page List block to the main content area that displays all pages "beneath this (your News page) page." Then select the order to display the most recent first. Finally, select the custom template News List Main for that Page List block.
To create a News Article, make a new page under your News page and choose the News Article page type. The News Article page type will automatically display the Title, Description, and Date on the page.
To display the Latest News on your home page or any other place, simply add a Page List block and have it show 2 or 3 pages that are beneath your News Page. Then, select the custom template News List for that Page List block to format it correctly.
To change the color scheme from the default blue to green or red, simply change the line that says blue.css in the screen.css file (located in the theme files at officespace/css/screen.css) to either green.css or red.css.