DMZ in mikrotik v 6.34.3

RouterOS Beginner Basics
1

need dmz for online gaming with no restrictions,
someone can help me to dmz in version 6.34.3?
i use dynamic ip, masquerade nat, and use pppoe

my config in mikrotik
ip >> adress: 192.168.88.1/24
network: 192.168.88.0

my config in pc:

ip adress:

192.168.88.254

what i need to do?

2

What restrictions do you have for the LAN?

3

nothing, i only have scr nat in firewall,
but when i’m playing my game, ‘’ Blade and Soul ‘’ some characters do not appear to me, can be any closed port, the game support told me.