Write it yourself, then. But it is a common problem among people who don't read the guides and have no previous knowledge about BBcode that they forget to actually put up the end tag on their links. They just assume it is alright when they have pressed the link button and pasted in the url. All codes need a start and an ending, as well as something that needs to be displayed in this code, which should be between the brancets and in the case of links, an url in the middle of the first tag.
But read the guide as mentioned. And if you can't paste, you might need to check your computer.
