If you are a long-term Delicious and sign in with an old Delicious login, then you can change that here: https://secure.delicious.com/settings/profile/edit For new users who sign in with a Yahoo ID, you can do it here: http://profiles.yahoo.com/edit/basicinfo (there will be a short period of tme until this syncs to Delicious)
Sorry, I just realised that I'm talking about the display name. However, if you want to move your bookmarks from http://delicious.com/signets.cefrio to another location, that's not really supported. You can export your bookmarks (https://secure.delicious.com/settings/bookmarks/export), create a new account, and then import them to that account, but you would not keep your tag bundles, of which I see you have lots...
On a related note, I have a Delicious screen name that is different from my Yahoo ID. When it comes time to merge my Delicious account with my Yahoo! account will I be able to change my Delicious screen name to my Yahoo ID or will it be like Flickr where it is just used to sign in? I've wanted to change my Delicious screen name for some time now to match my Yahoo ID but exporting and importing the bookmarks to another account looses too much of the extra data like tag bundles and submission dates.
Hi Jesse! No, it'll be more like Flickr, where the Yahoo! ID is just used to sign in. I believe the majority of users would prefer to preserve their Delicious account usernames.
The problem of not being able to change usernames is a separate issue, and we'll be working on ways to make it a little easier, such as preserving tag bundle information upon export and import. I don't have an estimated date for that, but we have it in mind.