Staff Edit: fixed the picture. Edit: emc being mean and not letting the pic work >:I https://imgur.com/a/JXdMT
Try using [img]https://i.imgur.com/2wkCVtF.jpg[/img] The [img] tags only work if there's an extension so that the forum knows that you're linking to a picture. Best you can do is to generate share links on Imgur and then copying the BBCode section. You can simply copy & paste that.
Also, you are using the imgur webpage link. You need to use the web address for the image. You can get this using the method Shel shared above (using Imgur's built-in BBCode generator) or you can right click on the image and click the option "Copy Image Address" to get the correct link.
Lol, nice shot. It's things like these when you question what is going on in Minecraft, especially their flawed horse breeding mechanics.
Yeah, I don't suggest doing big things such as posting a picture while on a mobile device. You can fix it later though when you can use a computer.