Humidity Graphing and views

Hi, I’m new to hassio so please accept my apologies if I’ve posted this incorrectly.

I have some temperature and humidity sensors (Bresser type) that use the 433Mhz rf protocol. I can get the temperature sensors working fine but I need the humidity info in a graph or anything. When I click on an item it does show the humidity but I’d like a graph or gauge to show this.

I’ve seen some excellent custom cards but I have no idea how to download them to my www folder etc. and use them - I’m still learning!

Thanks in anticipation for your help or pointers in the right direction.

Kind regards,