d8 damage dagger

We found some daggers in our campaign, The only difference with them, is that do 1d8 damage. I have created one and set the "modifier" to reflect this, but in the inventory, it still says d4 and it does not save to save for me. 

Okay, I was guessing I would need to do that. What is the "modifier" dropdown used for, for the different die types?

The die type?

I can't find where to edit the properties. I started with Rapier. I just need to add the thrown and piercing property. Piercing does already appear next to the damage type and Finesse and Vex are next to the Properties.

Okay, I found it, thanks. Too bad the range can't be added.