Is the new Tumblr Dash better? Yes
Do I also hate it? Yes
Enable mobile theme On the Customize screen turn off the Use default mobile theme option under Advanced Options. 
Add instagram feed Enter your username in the "Instagram Username" box. 
Display avatar image Upload an image to the "Header Avatar" option, square images work best. 
Remove stash credit Remove the stash logo from your website by getting a Full License.
More help & customization If you still need more check out our help section or the theme docs.