Controlling space between images

Hello!

A few related questions for a newbie…basically I’m looking to change the spacing between the images, on the Home gallery page, and separately on other pages.

1. Is it possible without changing/overwriting css code?

2. Can you recommend a code for that?

3. Is it possible to add text below each of the photo on the Home gallery page?

4. Since this is an RTL supported theme, how do I change the title position from left aligned to right aligned? (Have no problem with the body text)

Thanks a lot!

Mey