Discuz x1.5 developing embedded point related issues

Discuz x1.5 Development Embedded Point problem
Discuz x1.5 No QQ login function, I now want to write a plugin but do not know how to put the icon in the login box here,

Or do you want to write it directly in the login_simple.html file? If you want to write in the login_simple.html file, then the plugin will not be ready to install when it is written. Since the template file is also modified, there is no way to add this icon directly through the page embedding script plugin.
Note: I just learned discuz rookie.

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Explore
Discuz x1.5 No QQ login function, I now want to write a plugin but do not know how to put the icon in the login box here,

Or do you want to write it directly in the login_simple.html file? If you want to write in the login_simple.html file, then the plugin will not be ready to install when it is written. Since the template file is also modified, there is no way to add this icon directly through the page embedding script plugin.
Note: I just learned discuz rookie.

------Solution--------------------
How to use sHTML

