Stackposts accepts the proxies in 2 formats http://user:pass@ip:port and user:pass@ip:port For instance, if you have this proxy 1.2.3.4:12345:myuser:mypass in Stackposts you must enter like this myuser:mypass@1.2.3.4:12345 Related posts: How to use the proxies in Stackpost Wget with proxies Online Proxy Checker Online Proxy Tester Tagged: instagramStackpostStackposts