Do you want to make a random, always-changing, text? Maybe its a quote of the day, or maybe it's a list of random tips. Anyway, let us begin.
Your next step is to copy the code, go to your dashboard, click layout, and on the Page element tab click 'add a gadget'. Scroll down till you find the 'HTML' gadget. Hit the + button to add it to your blog. Then a window should pop up. Fill in the 'Content' with the code you copy earlier, hit 'Save' and position the gadget wherever it fits you. That's it, now you have a random text gadget!