i also could not.. and i see is useful for us all to be able to do.
i just wrote my tag proposal at tag box and when clicking on it it just dissapears
now a different topic, but i find the mention here:
what is this "trust level" thing?
i just read the thread https://meta.discourse.org/t/what-do-user-trust-levels-do/4924?u=paulkreuzer
but i find this hierarchichal and limitating.. i can see the need for spam prevention, but i don' support this criteria for attributes..unles until i understand better