To upload images to the forums, upload the image to a place such as Imgur or Gyazo. Then right click on the image, "Copy image address". Then paste the address into the text box on the forums and it should convert.
Restart your router, also check your dns settings on your router and see what they are. Set it to 8.8.8.8 -Google's DNS server, and alternative as 8.8.4.4 - Googles Backup