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While it's possible to approximate the location of menu items on your router's page, what you see will vary heavily depending on your router. Assigning a static (instead of a dynamic) IP address to your computer will prevent the IP address from changing if your computer ever loses its connection to the router. This means that you won't have to update your IP address in the server's settings each time you turn back on your computer. This list's location will vary, so try looking in the following places or menus:  Connected Devices Settings Advanced Settings Network Devices Parental Controls Scroll through the list of connected items until you find the IP address that matches your computer. This should be the "IPv4" address you found in the same menu as the router's address. Again, this will vary depending on your router page. You may need to click a lock icon next to your IP address, click a settings gear icon and then click Reserve next to the address, or check a "Reserve" box near the address. For specific instructions regarding setting a static IP address on your model of router, read the router's manual or online documentation. Click the Save or Apply button to do so. Now that your computer's IP address is reserved, you can finally forward the Minecraft port. Your router may need to reboot before you can proceed. If so, it will reboot automatically.
Understand that each router's page looks different. Know why you need to assign a static IP address. Find your router's list of connected items. Find your computer's IP address. Lock the IP address. Save your changes.