Make a box out of a greeting card!

Step 5 I fold...

 Okay, take your ruler, and line it up with one of the long lines, then press the ruler down and bring the long side up, see second photo. Do this on both sides. (see third photo). Then fold all the rectangular tabs in, make sure the edges all line up. (see fourth photo). Then, line your ruler up with the first of the shorter lines on one end, and fold like the long sides. (See fifth pic). Then do the second line, (see sixth pic) you should have two folds, now do the other end.