NO, You cannot. You are the only one that knew it and we didn't put any back door into Web Replay. We aim to give you the best security available for you confidential data. If you forgot your Master Password (or if you do not remember creating one but Web Replay requests it from time to time) then the only solution is to create a new database and start over saving your passwords. You can create a new database from the Master Password dialog. Press Options>> button and then in the databases comb box choose "Create a new database"