How to have that Envelope in my profile?

Q: Hi-I can't figure out how to switch my email address that shows in my profile to the picture of the envelopes I see on other profiles.

A: If the Envelope is shown, it means that other members can send e-mail to you from this web site.

In your [My Profile] there is a setting named [Allow users to email you?]. If you turn on that option then registered members can send you e-mail messages (not private messages) through this web site. Note that the sender will not see you email address. It is suggested to have this option on if you have an ad in the Ads Directory so that someone interested to contact you can inform you immediately.