Once you installed Chizzle as a zip file, follow these steps to get it up and running in Blender:

1. Open Blender Preferences
Go to the top menu bar and select Edit > Preferences. This will open a new window where you manage all of your internal settings and extensions.

2. Navigate to the Add-ons Tab
On the left-hand sidebar of the Preferences window, click on the Add-ons tab. This is where Blender lists all currently installed tools.

3. Use the Install Button
Click the Install... button located at the top right of the window. A file browser will appear. Locate your Chizzle.zip file.

4. Enable the Add-on
After clicking "Install Add-on," Blender will filter the list to show only the new entry. You will see a checkbox next to the name "Chizzle." Check this box to activate the tool.

5. Save Your Settings
If you want Chizzle to be available every time you open Blender, ensure your preferences are saved. In the bottom left of the Preferences window, select Save Preferences.