Hello, sorry for bad English.
After you install the plugin in the Forum, I will navigate more "Start" button ("Home") with reference to forum.php.Jak fix this?
Forum v.2.1
Thank you for your advice.
Not sure what you're asking for. If your question is "how do I add links to the Coppermine menu that point to my forum", then your question could be simplified to "how do I add menu items to the Coppermine menu", as the process doesn't depend on the link target, but on the theme you're using. As you have failed to post a link to your gallery (http://forum.coppermine-gallery.net/index.php/topic,55415.msg270616.html#msg270616) (as per board rules that you agreed to respect when signing up), we can hardly advice anything. Our board rules exist for a reason. Additionally, zip your custom theme folder and attach the zip to your reply.
Not related to plugins, but to custom theming - moving accordingly.
If your 'Home' button should point to forum.php, edit your 'URL of your home page' setting accordingly.