how do I change default email address from my computer

when we first set up our home computer we were with freeserve. We have moved house and no longer have orange broadband but when I try to send an email, from a web page or even to sent a phot from my photos it goes through all the steps but when I come to

press the send button there isnt one. Is this because we do not have an orange broadband account anymore.. If I just google orange and go in that way it will allow me send . Is it because it is the default email address and can I change this? I have been trying

for weeks to change it and now I am at my wits end.....would appreciate any help please but I am a total novice when it comes to IT to very simple instructions please.....Thank you in advance Hilary

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