More then three custom fields?

OK.
I found the php files I changed and now have 5 fields.
I have the:
class-anwpfl-helper.php
class-anwpfl-club.php

class.anwpfl-player.php 

club-header.php changed.

The only problem is that it is probably gone at the next update.
Is there also the possibility to insert an option, which makes it possible to do this directly over the Backed?

Unfortunately, there is no way to add more custom fields without basic PHP knowledge.

And yes, it is a bad practice to change plugin files. They will be overwritten in the next update.

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I can create a special UI for unlimited custom fields in the Premium version. Vote this for feature - https://anwppro.userecho.com/communities/1/topics/432-unlimited-custom-fields-for-player-club-stadium

Thank you for taking it to the vote,