First i created a new document with the recommended pixels. Than i chose the light green color instead of having just the transparent background. Than i started writting. First i typed in the letter "M" and than i pressed the "F6" key. Everytime i typed a letter in i pressed F6 right after that. Pressing F6 key after typing every single letter in makes it into a key frame. So, after that i published it without having the LOOP option checked.