forward unmute2(playerid);
public unmute2(playerid)
{
    GetPlayerName(playerid, name2, sizeof(name2));
    Muted[playerid] = 1;
    format(string5, sizeof(string5), "ET Bot: %s has been muted for swearing for 1 minute", name2);
    SendClientMessageToAll(playerid, string5);
    SetTimer("unmute", 1000*60, false);
}
new string25[700];
forward unmute(playerid);
public unmute(playerid)
{
    Muted[playerid] = 0;
    format(string25, sizeof(string25), "ET Bot: %s has been unmuted", name2);
    SendClientMessageToAll(playerid, string25);
    IsPlayerMuted[playerid] = 0;

}

SetTimerEx("unmute", 1000*60, false, "i", playerid);//this just means you are calling a function on a timer that takes "playerid" as a parameter.