Hi there Kelsey and Juhani, glad to have you as part of the Hive community! It does take a little time to get yourself oriented here... little more complex than Facebook.
It's great that you want to be part of the Caturday movement! Using #caturday as your first tag is a great way to go to get your post properly indexed. You can also join @saboin's Caturday Community and share your post there.
Yes, you're more than welcome to use the HiveCats image!
Have a great Caturday!
=^..^=