This theme tutorial is for the tumblr customize page as of January 2013. This tutorial applys to all of my themes except those which can be installed via the themes garden. I recomend using Google Chrome or Firefox as they are the most compatible with all tumblr themes.

Go to your blog and click the customize button or click here.

Click on 'edit html' this will show your current theme code.

Remove all the text in the html box: You can select all text by holding CTRL+A for pc-users and for mac-users you hold CMD+A.

This is where you need to paste the install code which you can get by clicking install on the theme of your choice you will be brought to a pastebin page with the install code for one of my themes. The easiest way to copy the whole code is to click on the clipboard. (my newest themes have a note which states the "END OF THEME" to indicate the end of the code.)

Paste Code Directly into the empty html box.

Click 'update preview'

Click Update Preview and save. You now will have installed my theme. To allow the customize page to update with the theme make sure you close the customize page and then open it again. IT IS IMPORTANT YOU DO THIS STEP TO ALLOW OPTIONS TO APPEAR.

AFTER STEP 6 the customize page shoudl have updates and you can now edit the variables such as colors, fonts and even number of columns!