On betterbets, open the menu on the left side of the site, click on "your account". in the window that appears, check "enable api access" and click on save. Scroll down a bit and you will see your api token, it will look something like: "5603540fd83d0b24bf8abdba0cb05242db06cf117d97ce2ee7bfb47021c63762"

This is your api token. Make sure you copy only this value and no spaces. You can paste it into the password box in dicebot using ctrl+v