Added task for single accounts (#21970)

Author: dcpena

src/assets/images/fundamentals/get-started/single-account-id.png

@@ -17,6 +17,15 @@ Once you [set up a new account](/fundamentals/setup/account/) and [add your doma
 
 4. Select **Copy account ID**.
 
+### Users with a single account
+
+To copy the account ID when you only have one account:
+
+1. Log in to the [Cloudflare dashboard](https://dash.cloudflare.com/login).
+2. From **Account Home** page, select the menu button next to your account name.
+3. From the list that appears, select **Copy account ID**.
+![Screenshot of the Overview page with the API section highlighted](~/assets/images/fundamentals/get-started/single-account-id.png)
+
 ## Copy your Zone ID
 
 1. Log in to the [Cloudflare dashboard](https://dash.cloudflare.com/login).