1. Pop up tag - Construct a tag starting with a piece of paper measuring 2-3/4" x 5-1/4". From there you can be creative using more papers or other fun elements from your stash to decorate your tag. Keep in mind the bottom one inch of your tag will be covered so don't decorate that area. Also, try not to use heavy embellishments that will make the card lean back too much and therefore become unbalanced.
2. Card base - This is the trickier part of the card, so please measure and cut carefully for this section. Cut the paper you want for the base at 4-1/4" x 11". I'd use a heavier weight cardstock so your card holds up better. If you want to stamp or emboss your cardstock, now is the time to do so while it is still flat.
3. Scoring - Starting from one end, score at 1", 2-3/4", 3-3/4", 5-1/2", 7-1/4", 8-1/4" and 10".
4. Slit - To cut the slit where the tag will pop up from, fold the base in half at the 5-1/2" mark. Cut out a thin section 1/2" up from both edges. The darkened rectangular section in the photo below is what you will cut out. It measures 1/8" x 3-1/4". If you used bulkier embellishments, then you need to cut a wider rectangle so your tag will fit.
When you open the base back up, it will look like this.
5. Adhesion - Put your adhesive on both one inch scored sections on each end of your base. It will be on the side of the paper that you want showing.
6. Attachment - Slide your tag into the slit and line it up to the bottom of your base.
7. Completion - Press the two one inch sections with the adhesive together, so the adhesive sections are facing each other with the bottom of the tag in the middle.
8. Finishing Touches - You can decorate the base of your card further, including tying a ribbon through the base or adding stickers. Or just leave it as is, especially if you've stamped the base or used a patterned paper. For your viewing pleasure, here are two other cards I had previously made in this style.