Hey peeps, so I'm trying to create a thread with an image in the original post but for some reason, when I click on the Creat new thread thingy, it loads an error page and the thread won't post. Anybody has an idea of what is going on? I tried with different versions of the image but it still won't work. By the way, I'm accessing the website via my cellphone, if that has any importance
That means the image is too large. I'm pretty sure both file size and resolution matter. Try keeping it under 1MB and no bigger than 720x1200 pixels.
If you're on Windows, right click the image and select "Properties." The size will be listed in the General tab. Both size and resolution can be found in the Details tab.
You'll need an image editing program to resize it. Some websites (like Pixlr) have similar features.