[HyperZ]

Put it on Top of your script:

pawn Код:

new Text3D:label[MAX_PLAYERS];

OnDialogResponse:

pawn Код:

if(dialogid == DIALOG_Headtext)
{
    new string[128], str[64];
    format(string,sizeof(string),"%s",inputtext);
    label[playerid] = Create3DTextLabel(string,0x008080FF,30.0,40.0,50.0,40.0,0);
    Attach3DTextLabelToPlayer(label[playerid], playerid, 0.0, 0.0, 0.7);
    format(str,sizeof(str),"Your 3dtext has been set to %s",inputtext);
    SendClientMessage(playerid, COLOR_GREEN, str);
    return 1;
}

Edit: Not tested.