Full Frame theme customization

Hi I’ve purchased Full Frame theme and I really like it!
How can I join the premium theme discussion and post my questions to Chandra Maharzan?

I hope someone here can help me in couple of things on my website https://www.awakeningaustralia.com.

1) I really struggle to see the post images on my home page with the same proportions by resizing the browser window. There is always a portion the image goes out of margins somehow and the information on the image get cut off. The problem increase also on the iPad and even worse on the iPhone. There is anything in the css code that can auto-resize the images maintaining the original proportions? (see https://www.presenceconference.com on pc, iPad and iPhone to see an example of what I need to achieve)

2) I would like to modify the translucency of the background of the top mobile menu and also the height of it.