The order is important.

1. comment out texts about the promo being over
2. uncomment texts about the promo being active
3. uncomment the form code in the index.html
4. change texts and links to corresponding typefaces (in index.html and landing.html)
5. duplicate form on Wufoo
6. change the Wufoo form ID from the old to the new form, e.g. s9t656j1jqcbi8 in <div id="wufoo-s9t656j1jqcbi8"> (the code repeats several times in the code. Replace it everywhere.) You get the new code on Wufoo (form > Share).
7. update the form with the current typefaces/specimens
8. git commit & git push

1. uncomment texts about the promo being over
2. comment out texts about the promo being active
3. comment out the form code in the index.html
4. export entries from Wufoo form, delete all entries from Wufoo
5. git commit & git push