How do i put a specific Username?

[NickGames2022]

Quote

class CustomRank {
    constructor(player) {
        this.playerName = player;
        this.useCustomName = getSetting("Name Change Enabled");
        this.customName = getSetting("Custom Name");
        this.easyRankSwitchEnabled = getSetting("Easy Switch Enabled");
        this.easyRankSwitchValue = getSetting("Easy Rank Switch");
        this.freeTextValueRank = getSetting("Anything as Rank");
        this.settingsUpdateInterval = 1;

this.playerName stores MY name but i want a custom IGN to be that How?