Step 1:

Select the blog whose description you want to justify using the drop-down menu on the dashboard, and then click "Customize." If the blog is your primary blog, you don't need to select it first; just click "Customize."

Step 2:

Click "Edit HTML" to open your blog theme's raw HTML code.

Step 3:

Click the gear icon and select "Find and Replace" from the drop-down menu.

Step 4:

Type "{Description}" without quotes in the "Search for" field. The code automatically scrolls to display the relevant line.

Step 5:

Click into the code to activate the text box and place the text cursor immediately before the right angle bracket that directly precedes "{Description}." Type a space and then type or paste the following code:

style="text-align:justify;"

Step 6:

Click "Update Preview" to preview the changes and then click "Save" to save them. The "Save" button is not visible until you have previewed the changes, so you can't skip the preview step.

Step 7:

Click the Arrow button to return to the blog customization screen and then click "Exit" to return to the dashboard.