Fill in your details, pick a layout, then copy and paste into Gmail Settings → Signature.
Add earned badges like QuickBooks ProAdvisor or Xero Certified. Paste a direct image URL for each; the link is optional (e.g. a verification page).
Email signatures can't use images stored on your computer — the image has to live online at a direct URL. Here's a free way to get one:
Quick test: paste the link into a new browser tab. If you see only the image on a blank page, it's the right kind of link. If you see a regular web page with buttons or menus, it won't work — go back and copy the direct image address.