Teachers-Account needs to be validated manually but usually, the accounts are activated within 24 hours.
To speed up the process or if there is any holdup please contact Nils Krüger (krueger(at)kh-berlin.de) and Thomas Ness (ness(at)kh-berlin.de) via e-mail. Please include in the e.mail information about your department, course and maybe weißensee contact / reference person.