Unclear how to add more than one additional boards manager URL.

[damellis]

Having a single text box for multiple URLs seems awkward. In particular, it's not clear how to add multiple URLs, i.e. what to use to separate them.

[probonopd]

Separating the URLs by comma (,) works for me

[BrentWilkins]

A comma is the way to go AFAIK, but a note next to the field wouldn't hurt.

[ffissore]

Fixed in hourly build (available in the next few hours). Added a tooltip to both label and text field. Hourly also features a button that will open (yet-another) tiny modal where urls can be written one per line