Samsung Password Nightmares

I've had my Wave II s8530 for a while and recently bought a Tab 2 10.1.  My Samsung Accounts are Samsung Apps, Samsung Dive and a login on their main site for product registration which goes back a while and was an older email, password.  Eventually after an exchange with Samsung who don't seem to understand simple questions, I've managed to have them all registered under the same login as my Samsung Apps/Dive.
Now heres the thing, as far as my phone is concerned, the only thing that's changed is the Samsung Apps/Dive password.  Do you think I can login to Samsung Apps.......can I hell.
I went to the phones settings/accounts/Samsung Account..that wont let me in so I tried the change password area,  cant do nothing there so here's the question.........

If I delete the Samsung Account from the Phone - can I then set it up again afresh??

If I set up a new account, do you happen to know if I can use the same email as the original - much like re-setting up my existing account on a new phone?

yep gas75 is correct you will need to use another email address....do what I did.use a gmail address.