Farah's talking about something different: AirBnb is testing a targeted-discount feature which bypasses the standard price-adjustment tool. Hosts receive an email suggesting that they enable a one-time 10% discount on specific dates; the email contains a button which *should* take the host to a special menu option:
For some reason, the feature isn't working smoothly; many hosts (including myself) receive the email, click the button, but are not able to access the necessary menu option, leading to "am I doing something wrong?" syndrome.
It's still possible to add the one-time discount manually using the traditional menu tools, so it's not a huge problem, but it is very confusing. I thought that I was (wait for it) doing something wrong...until I came to the forum and saw that it's a glitch affecting lots of hosts. Hopefully it will be resolved soon!