Open your Salesforce Developer account or Sandbox, and navigate to the Apex Trigger editor.

Paste the code I wrote for you into the editor.

Click the "Compile" button to ensure that there are no syntax errors, if there are errors, just paste them here and I will assist you.

Create a few new Account records with names that contain the word "test" and leave the account number field blank.

Save the new accounts and observe that the trigger updates the account numbers with the prefix "test" and a random number.

Check that the trigger works as expected by confirming that the account numbers are updated with the prefix "test" and a different random number each time.

Test the trigger thoroughly to ensure that it does not have any unintended side effects.

Once you have tested the trigger in a sandbox environment and confirmed that it is working as intended, you can then deploy it to your production environment.
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