Add extra buttons to toolbar

Hi

I am very new and I would like to use this plugin. Currently I am investigating this product.

I am using this plugin with java and jsp.

At the moment I have toolbar as in this page.

I would like to add formatting text button to the menu.

I tried as below in config.js and add all the plugin script in the plugins folder.

    // The toolbar groups arrangement, optimized for two toolbar rows.
    config.toolbarGroups = [
        { name: 'clipboard',   groups: [ 'Cut','Copy','Paste','PasteText','PasteFromWord','Undo','Redo' ] },
        { name: 'editing',     groups: [ 'find', 'selection', 'spellchecker' ] },
        { name: 'links' },
        { name: 'insert' },
        { name: 'forms' },
        { name: 'tools' },
        { name: 'document',       groups: [ 'mode', 'document', 'doctools' ] },
        { name: 'others' },
        '/',
        { name: 'basicstyles', groups: [ 'basicstyles', 'cleanup' ] },
        { name: 'paragraph',   groups: [ 'list', 'indent', 'blocks', 'align', 'bidi' ] },
        { name: 'styles',      groups : [ 'Styles','Format','Font','FontSize' ] },
        { name: 'colors',        groups : [ 'TextColor','BGColor' ] },
        { name: 'about' }
    ];

But it doesn't work. Please some advice me and put me on the right track

Thanks