Scores can only be uploaded from a user's end only in Fixture-based tournaments like FIFA 19, CS:GO, 8 Ball Pool, Fortnite 1v1/2v2, Arena of Valor etc.
Scores for PUBG Mobile, PUBG PC, Clash Royale are updated by the Admin Team and users are just required to take screenshots of their final match result.
Please note that scores for a particular Round number can only be set after the round time starts as mentioned in the 'Fixtures' page as shown below:

You can upload your score by clicking on the button below:

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