To create a fixture you first need to add the opponent

Here's how you do this: 

1. Go to the Fixtures tab and click on the "Opponents" button. 

2. Click on the green "Add" button behind Opponents.

3. The Opponents screen opens where you can enter all kinds of information about the opponent.

4. After you have entered all the information, the screen can look like this.  The mandatory fields
are name and country.

5. Add the logo of the opponent. It needs to be a PNG file, square and only use the best possible
resolution (mandatory).

6. Save it and the opponent stands between the other opponents.