How do I get a proxy to access 4chan under different flags? I

You need to use a proxy that operates in a country you want your flag from.

>>55464400
the captcha doesnt work

>>55464432
Your proxy must be abused by bots. Either pay for a good proxy/VPN or buy a 4chan pass. You're unlikely to find a free proxy that recaptcha likes.

>>55464475
I use pass and it tells me that another ip is using my pass, even after 30 minutes of not posting

>>55464496
So your (free or cheap) proxy dumps all of their clients into one IP address.

Use a better one.

If you are not technically retarded, I'd suggest using a VPS service, just install a proxy server on a linux box somewhere in india or anywhere. It might even be mich cheaper, because you can turn off servers that you don't use at a given moment and don't pay then.

>>55464496
Digitalocean gives you $10 for free, that is two months of noninturruped servers running, even more than 2 months when you stop them when not changing flags.