On international keyboard on Windows, they don't even support Ĉ. When you want to type something with a ^ over it, you type ^ and then type the letter, so ^ + o = ô. However, when you do that with the letter C, you just get ^c, so even if you planned for this and installed the international keyboard, it still doesn't work!
Try to install this plugin for Google Chrome https://chrome.google.com/webstore/detail/anstatauxi/geffaabblpcfabmjdoipmfplglceofgj
or you have to install some layout in Windows with the keys for Esperanto.
I think "i won't tell" is in the future tense, but the sentence is esperanto is not. So maybe we better say "I do not say". Actually , depending on the context you could translate in english differently to keep the appropriate sense, but as isolated as the sentence is in the question, i can't tell... :D