Just wondering how to... :)

There will always be at least one visualisation - it's what visually themes your diary frontpage and your entries.

If you have a BloopXtra membership - you can have multiple visualisations and have seperate designs for frontpages and entries.

If you do need to delete one, you can scroll down on the My Diary screen under Manage My Diary

The entire Bloop Team came to help you! :) You can always edit the visualization whenever you want under Manage My Diary.