How to make a "Write your own name!" animation:

find the text tool in the side bar on the eft hand side of your screen.

type your name.

once your name is typed, use the erase tool (the tenth tool down on your left side bar) to erase the PART of the first letter of your name. You want to make sure you start at the end. 

You want to duplicate your layers frequently so your animation isn't choppy (to duplicate/copy right click for the menu.)

After you duplicate your layer, hide the previous layer by clicking on the eye. This makes it so you can see what you are erasing. 

Continue erasing each letter (in order) using the steps listed above. 

when you are completely done with erasing, click "Create Frame Animation" if it says "Create Video Timeline" click on the drop arrow directly to the right of it to change it.

Then, select ALL of your frames. To make sure they are all together click the first one then hold down the "shift" key and click the last one. 

After you've selected all of the frames, click the menu in the lower right hand side. 

from the menu click on "make frames from layers" 

At this point, the layers will not have a back ground. select all of your layers (shift click) and click on the eye next to your background layer (you will need to click twice)

Select all of your layers one last time (shift click) and hit reverse frames

When you are done, change "once" to "Forever"

you can do that by clicking on the tab.