Gentlemen, good night ......

I had written for support and received an email back telling me about the settings in my profile and change the e-mail primary and secondary .... And I went and deleted my primary e-mail and put the secondary. ..... Now I noticed that my e-mail account (that was the primary) disappeared .... and this is the email I do my campaigns ..... How do I return the primary email ? I've tried everything and can not seem to nehum way .... he only of the message that the e-mail already exists .... more there and it is my ...... how do I get back my power and -mail main ???