How to connect to the Internet for OSPF routing

Hello, i would like to ask, i have this OSPF topology using Mikrotik CHR 7.7, my problem is the router that only connect to the internet is R5, but i want other routers also can connect to internet through R5, how can i configure it?
If possible the solution can be configured from Winbox because i usually configure my routers from there

You can specify

originate-default=if-installed

On your OSPF instance on R5.

https://help.mikrotik.com/docs/display/ROS/OSPF

thank you so much, now my problem is solved

Hi, I’m very glad you solved the problem, but I and the forum would be so much happier
if you also mark your case in this forum as solved.

See the pictures below.
Where you click on the following places on the thread that solved your problem.

So the AI can take over and know what the problems are with the respective solution.

Thank you.

At board style: Canvas

At board style: prosilver