Basic MikroTik Rip

Hello,
I started working with virtual versions of MikroTik and I don’t think I really get the whole thing. So I am asking you if somebody could be so nice and make some tutorial or something how to do rip routing in Winbox. I am really desperate 'cause I tried so many times and it’s still not working.
On M03 we should set the default path to 172.31.109.210 and promote it to network.

LAN 1 : 10.9.1.0/24
LAN2 : 10.9.2.0/24
LAN3 : 10.9.3.0/24
WAN : 172.31.109.0 /24

PC: IP= 10.9.1.1
M01: e1= 10.9.1.2 e2= 10.9.2.1
M02: e1= 10.9.2.2 e2=10.9.3.1
M03: e1= 10.9.3.2 e2=172.31.109.9

Thank everybody who is willing to help .

Is the problem you’re having that the default route isn’t being sent to all routers?

Set a static route on M03

/ip route add dst-address=0.0.0.0/0 gateway=172.31.109.210

The set RIP to send a default either always or if-installed

/routing rip set distribute-default=always

Check M01 and M02 now have a default route.