desperate (accessing mail)

So i really hope i get the answer im hoping for ....

Thank you so much in advance for any help .

i did the username change thing on my MBP without realizing
it would lose all my settings and mail account etc ..

Ive tried to get it back but cant seem to do it .

ive given up on that but ,,,

my main concern is to be able to access my mail account .

i have a domain mail (guess thats what its called ?)

like ... myname@example.com


My question is ... Can i access this mail from other computers ?
how do i get into my mail on another computer ?
If I can get it back on my MBP i will go to the cafe etc..

Sorry , i know very well i sound like a complete fool .

Please help !

Thank you thank you

 

so the fact that i can not access my mail account on my own computer because the settings have changed (thanks for that info link) should have no effect on me accessing my mail on another computer ?

i know how to access my yahoo account from a different comp but what about a mail like myname@example.com
how do i access that from another comp ?

THANK YOU