Yes, at this moment you will lose all your data
... BUT before of that, you can export your data (check menu options) to a external file. Then after delete complete data and create a new one with new password, you can import again.

Notice that current export/import functionality doesn't work for images, images can only be exported manually one by one (again check menu on detailed screen or click for a second on each image)

About login page I'm trying to make buttons bigger. Otherwise I always use keyboard (in that case you can also use alpha characters!)