Please I need help from this forum in my inquery if that possible:

I have a mikrotik router and i provide the internet [vpa], but i have another question about the source of internet I have another link which is from adsl modem and out from this modem i use the internet to the lan card in every pc or switch without any login or somethin ,because now this sourc for me is dhcp, The question is in that point : How I can to input that internet in mikrotik router v 2.9.27 and that source of internet to provide via lan or wlan to other client, but first I NEED to know to input the internet from the switch from this sours [in the dhcp mode in my pc the ip gained from this adsl modem showed like this
ip - 192.169.1.100
subnet mask - 255.255.255.0
IPv4 default gateway 192.168.1.1
IPv4 dhcp server 192.168.1.1

IPv4 DNS server 192.168.1.1

that is shown in my pc when i see the details


I need that internet to input in my router and to route in other interfaces
How I must to write the mode or the ip when i connect to this lan ,please explain in the siple steps that ,thanks