Hey again,
For if my question is not clear, I’ll add some further information:
The php I want to change is this one:
/public_html/wp-content/plugins/shapely-companion/inc/widgets/widget-home-portfolio.php
I want to add a class to the portfolio titles and images.
As I assume from older posts like this one ( https://colorlibsupport.com/t/change-widget-id/ ), earlier the widgets phps where inside the shapely folder but now they’re in the plugin folder. This is why I don’t know how to modify them.
I hope that makes it clear. Sorry, I’m not a pro coder yet 
I hope you can give me some more advice.
Anna