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+## Create and Modify real Calendar in Thunderbird Calendar Client
+
+This page assumes three conditions:
+1. Radicale is running on Server (localhost [loopback], 192.168.1.20 [locally], 111.222.333.444 [public IP])
+2. You have already created a CalDAV calendar collection ("fakeusercalDAV01") via browser
+    - You visited http://localhost:5232, https://192.168.1.20:5232, or https://111.222.333.444:5232
+3. You know the URL of your CalDAV calendar collection
+
+> [How to meet these three conditions?](https://github.com/Kozea/Radicale/wiki/Simple-installation)
+
+### Create New Calendar in Thunderbird
+- Open Thunderbird
+    - Click "Events and Tasks > Calendar"
+    - Click "File > New > Calendar" [or right-click "Calendar Pane > Calendar List" area and select "New Calendar"]
+- Select "On the Network" in the dialog box and click "Next"
+- Select a Format and Location and click "Next"
+    - Format: CalDAV
+    - Location: Copy and paste fakeusercalDAV01's URL (all of it)
+        - e.g., http://localhost:5232/fakeuser/775e38a1-32eg-9e0x-e3tn-fax92930uskl/
+        - e.g., https://192.168.1.20:5232/fakeuser/775e38a1-32eg-9e0x-e3tn-fax92930uskl/
+        - e.g., https://111.222.333.444:5232/fakeuser/775e38a1-32eg-9e0x-e3tn-fax92930uskl/
+- Enter a Name, Color, and Thunderbird email account and click "Next"
+    - Name: TB Real Radicale Calendar (TBRRC)
+    - Color: [color you would like to indicate an event on TBRRC]
+    - Email: [default]
+- Click "Finish"
+
+### Modify TB Real Radicale Calendar
+- Click "Events and Tasks > New Event"
+    - Select Title, Location, Start and End Time, and Calendar and click "Save and Close"
+        - Title: Radicale New Event
+        - Location: 123 Main Street
+        - Start and End Time: 01 Jan 2000 15:00 to 01 Jan 2000 18:00
+        - Calendar: TB Real Radicale Calendar
+
+> Hopefully, you do not see a yellow triangle with black "!" in "Calendar Pane > Calendar List" next to TB Real Radicale Calendar.
+> Hopefully, "TB Real Radicale Calendar" text is not greyed out.
+> Hopefully, no error message upon "Save and Close."
+
+### Verify Modification of CalDAV backend
+- Return to browser, http://localhost:5232, https://192.168.1.20:5232, or https://111.222.333.444:5232
+- Click URL for "fakeusercalDAV01" and save .ics file
+- Go to folder with .ics file and open .ics file _with a text editor_
+- Enjoy ~50 lines that represent your "Radicale New Event" in your "TB Real Radicale Calendar"
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