Apply css class in tinymce rich text editor

Questions
1

Hello folks..

Hope everyone of you are Good..

i would like to have some pointers as how to apply css class instead of style for forecolor in tinymce editor?

Thank you

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/10519-apply-css-class-in-tinymce-rich-text-editor