Lets get straight into it :
1. Launch Opera Mini and open a new tab
2. Now visit the site you want to view the source code for
3. To view the source code go to the url field and replace the url to your site with server:source
5. If you did everything right you will see a page with the source code like the one below
And that's all you need to do.
Got questions or want me to do a tutorial of your choice, comment below.