What do you mean by 'secondary' email address? The email address you registered with cannot be seen by anyone or harvested by bots.
IF you want to post an email address which is 'public' (that everyone can see - NOT RECOMMENDED due to spam harvesters), you can put it in the appropriate field in your Profile. Look for the 'Public Email Address' field near the bottom of the page.
NOTE: Other than in the 'Jobs' forum, email addresses are not allowed in posts.
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Re: Email - How do I post my secondary email address?
Assuming that you use several mail addies for different purposes, my suggestion is to leave things the way they are here in the cove (Use one addie hidden behind the profile as suggested by Marc - See the link), and then set up rules/filters or whatever it is called in your mail client to forward the stuff you want to other mail accounts. This works well for me.