If you click on the button beneath the 'Additional Tags' field that says 'List 28 Additional Tags' you will see the (very limited) number of tags allowed in this field. (Previously in sign-ups it automatically listed them out with check-boxes; it seems to have stopped doing that and now takes you to a separate page, which is annoying. I'll look into trying to fix that, but if it's a quirk of AO3 then it may not be possible.)
Each of the tags in that list starts with either 'Want' or 'DNW'. Select the one that applies to you for that particular trope/genre/etc. (That is, if you want ABO, then select 'Want: ABO'.)
If you have additional Wants and DNWs that are not on this very limited pre-set list, then please list those in your Offer Letter as described in the sign-up instructions. We expect the majority of participants will have additional Wants and DNWs beyond what the tagset allows (and sign-ups have so far borne this out).
Re: Additional tags
If you click on the button beneath the 'Additional Tags' field that says 'List 28 Additional Tags' you will see the (very limited) number of tags allowed in this field. (Previously in sign-ups it automatically listed them out with check-boxes; it seems to have stopped doing that and now takes you to a separate page, which is annoying. I'll look into trying to fix that, but if it's a quirk of AO3 then it may not be possible.)
Each of the tags in that list starts with either 'Want' or 'DNW'. Select the one that applies to you for that particular trope/genre/etc. (That is, if you want ABO, then select 'Want: ABO'.)
If you have additional Wants and DNWs that are not on this very limited pre-set list, then please list those in your Offer Letter as described in the sign-up instructions. We expect the majority of participants will have additional Wants and DNWs beyond what the tagset allows (and sign-ups have so far borne this out).