How do i find my alternate yahoo e mail address so that i can check it.?

i don't know much about computers. my friend set my e mail up for me, and then my computer guy made me one too. so now, i've been going by the one that computer guy gave me when i go to sites such as ebay and didn't realize that i can't check my e mail because my yahoo is apparently set on the e... show more i don't know much about computers. my friend set my e mail up for me, and then my computer guy made me one too. so now, i've been going by the one that computer guy gave me when i go to sites such as ebay and didn't realize that i can't check my e mail because my yahoo is apparently set on the e mail my friend set up for me.
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