Image problems on Gemer theme?

Hello, I’m having trouble getting images to show on my website’s homepage. I’m using the Gemer theme, and when you go to the site – http://pittsburghhomecare.org – you can see that many images are not showing up on the interface. Is there a way to correct this using HTML, or perhaps another part of the dashboard that I’m not aware of? Thank you!

Also, once this is resolved, I’m looking to place our logo in the header. Is there also an easy way to do that, or should I look into a different theme?

Thank you!

Brenna