To create a contest in vJudge using Codeforces problems, you can follow these steps:

1. Log in to your vJudge account and click on "My Panels" in the top menu.

2. Click on "Create Panel" and select "Virtual Contest" from the drop-down menu.

3. Enter the required details for the contest, such as the name, start time, duration, and password (if any).

4. In the "Problems" tab, click on "Add Problem" and select "Codeforces" from the list of online judges.

5. Enter the problem ID or URL for the Codeforces problem you want to add to the contest. You can add multiple problems by repeating this step.

6. Once you have added all the desired problems, click on "Save" to save the contest settings.

7. To start the contest, click on the "Start" button in the "Contests" tab. Participants can join the contest using the link and password provided.

That's it! You have now created a vJudge virtual contest using Codeforces problems. Participants can solve the problems and submit their solutions, and the contest results will be automatically calculated and displayed in real-time.