Keep the default 192.168.88.1 unless it conflicts with your modem.
Once the basics are in place, you can explore advanced configurations that add flexibility and security. mikrotik router quick setup link
To help you get the best performance out of your hardware, tell me: What is the of your MikroTik router? Keep the default 192
Used if your router is acting as a wireless service provider client or a complex outdoor access point. Used if your router is acting as a
The Quick Set and Webfig interfaces are not designed to be used interchangeably for complex setups. While non-conflicting settings can be configured in both, it is . If you are going to use Quick Set for initial setup, it’s best to stick with it for the basics. Once you need advanced functionality, you should leave Quick Set behind and use Webfig (or Winbox) exclusively for all further configuration.
This is a frequent first-time setup issue. Try the following steps: