Theme Basic by themify – How change css style in texts

I didn´t have problem to change any css style in this theme by themify, but in text that I put in text panel, simply I can´t edit nothing about css. I try to change h3, ul position, but anything does this. Any help to me, please? I know they have a forum and support in their site, but only to people buy their themes, and now I´m using a free theme.

Thanks a lot!