After MANY questions in regards to how to get the dashboard theme, I’ll break it down to you as best as I can.

First, you MUST install the stylish add-on for either google chrome and or firefox. (Click on name of browser to be redirected to the site to download Stylish)

If you are using a browser other than those two you will have to install either greasemonkey and or greasekit that will help you manage scripts.

Once you have done that, go back to my dashboard theme that you want to use and in the green box click on “Install With Stylish”, other browsers click on “Install as userscript.” All my themes can be found here.

Once you have done that, check out your tumblr and it will be there.

How to uninstall a theme:

This is for google chrome and firefox users.

Google Chrome - Tools > Extensions > Stylish Options > Click on disable or uninstall if you want to get rid of it altogether.  

There might also be a “S” sign in your top tray on the right side of the address bar, click on it > disable or delete.

Firefox - Options > Add-ons > User Styles > Disable or Uninstall.

Hope this helped those with questions.