How i can change the Staff Icon

[Canapin (Coin-coin le Canapin)]

Not sure if that can help, but maybe you can have a look at this:

Replace Discourse's default SVG icons with custom icons in a theme

As of Discourse 2.3.0.beta6 (and thanks to @pmusaraj) you can now add custom SVG icons and override the defaults within a theme. You can replace a single icon, or the entire set. Here’s how: Create an SVG Spritesheet To get started, you must combine your SVG icons into a single spritesheet. If you have a few icons it’s easy enough to do this manually. If you have many icons, there are ways to automate this. If you’re not already familiar with some of the Grunt tools to combine SVGs, the simple…

Introducing Font Awesome 5 and SVG icons

We will shortly merge into master a branch that upgrades Discourse to Font Awesome 5.5.0 (the free version) and switches to using SVG icons instead of an icon font. This is a substantial change, with lots of benefits, and one significant change for developers. Here is a quick rundown of the changes: using SVG icons will provide crisper icons, better for accessibility and easier to customize, see this Github article for more details since the Font Awesome icon set has grown to 1300+ icons in v…