Changing User Roles / Deleteing User Accounts

While creating my site i have been using the test server built within visual studio to test my site.

But now i want to upload my finished site but want to know how i can delete user accounts and set/change roles while it is online.

I have been doing this within the ASp.net config site, but when i upload it how am i to change these?

do i have to download the site off of the server and do it within VS or is there an easier way to do this?

Thanks
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