对Linux不是很了解，今天要安装MTL4的库的时候就傻了。
1.add the url repository http://www.simunova.com/rpm to your repository list and update. （There will be 2 error messages that come from missing signature. Please ignore this warning for the moment. Later we will add this signatures to avoid these errors.）
2 Search the package "mtl" in your package manager
3.Mark the desired packages and accept all dependent packages.
我不知道如何 add the url repository to your repository list and update 。
然后查了一下，也没有查到相应的解答，请问大神们，我该在控制台输入什么命令，或是在哪里添加该URL？
感激不尽。