Port forwarding / IPv4 / localhost and ngrok

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Hey everyone i'm a newbie to kali linux and i've faced issues with ( Kali linux / Ip / Port forwarding / python / ngrok ) As the described in the title.

So my issue is the following : I installed a program on github that runs python( to create webpages ) and ngrok for port forwarding . And if you're fimiliar with ngrok it runs tunnels to localhost ( which i guess is fixed right ? )

My Question is : I'm trying to run multiple pages on my localhost . What's the best solutions to do , i'm thinking about eitheir changing the ipv4 ( is it possible ) or creating aws cloud ( vps ) to fix this . What do you think guys :) ?

Edit : i've tried to change the add ports to ngrok , but as i said the program runs python and i'm a newbie :(

Thank you for your time.

What I have tried:

i've tried to change / add ports to ngrok , but as i said the program runs python and i'm a newbie :(