Urgent assistance on Hueman theme

Hello Everyone,

please i need your urgent assistance on my safety Blog. I install Hueman theme, presently having some issues with adding adsense advert to the header, page and widget parts. Am also having issue reducing the font size in the category widget i install and page font size. my blog is https://www.safedriving.com.ng please you are free to review my blog and advice on what i should do or install to make the blog a standard website.

Thanks.