How to customize category's posts?

Hello,

I am using BLOGG template and I would like to change its blog template a little bit. My menu points to categories and when I click it gives me a simple layout without social media sharing tool.

So I would like to know how to change/add:
1) add social media sharing widget below the post *solved (I managed using hooks)
2) change the colours of titles, links and metas
3) How to remove the links: category's name and previous post link that shows after the content?*solved (I used customizer)

I am having a hard time to customize the posts layout. tks for the help.

I'm using the bet version 1.7-rc.2