[quote=@Cardamonelaw]
Can someone explain how using this sites die roller works? I assume we'll be needing to roll initiative soon. 
[/quote]
You have to create a new dice campaign. Then you type your roll like 1d20+5. Don't add any spaces into the dice or it won't roll. You can then describe your roll in the other box, such as "Ada Initiative." It will spit out a result and a link. You can copy the link and paste it into your post.

As an example (and also my Init roll):
Ada Initiative: 1d20+4 = [url=https://www.roleplayerguild.com/rolls/3349]14[/url]