How do you hightlighe a row in Writer

[missey]

I am using Windows 10 64 bit and Version: 6.0.5.2 (x64) of Libra

[Platterbaff]

Select the text on the row (or as much of it as you want highlighted), then Format>Character>Highlighting and choose the colour you want.

Or follow the advice at https://help.libreoffice.org/3.3/Common/Highlighting .