Thanks in advance
For delegators, it’s automatic.
After producing one or more blocks in an epoch, 2 epochs later the protocol automatically pays the corresponding block rewards. First this amount is partly sent to the operator by deducting the fixed fees and then the margin fees of the remaining rewards. The rest of the rewards is then automatically distributed among all delegators (including pool owner(s)) proportionally to their stake.
See example here:
How fixed & margin pool fees affect Cardano delegators? (ada4good.com)
Perfectly explained. Thank you very much.