Share buttons stacked vertically??

I’m using the Arcade Basic theme.

My share buttons are stacked vertically in my Hupso Share Toolbar. Obviously, I’d like them to be horizontal. How can I fix this? (If it involves editing CSS, please tell me where I need to add what…ie. how to get to what I need to get to. I’m kinda new to this.)

https://wordpress.org/plugins/hupso-share-buttons-for-twitter-facebook-google/