Bradley, profiles on WikiTree do *NOT* "belong" to any member. The member who first adds the profile becomes the "profile manager", but that is very different than having ownership. On WikiTree, we all share all the profiles that are here. The profile manager has some responsibilities, namely to respond to email contacts about the profile and to do the research to find information about the person, enter the data, and write a biography with source citations supporting each fact in it. Also, we collaborate here - other members may also contribute to the data, biography, and sources if the profile privacy level is open (as it is required to be for persons born more than 150 years ago or died more than 100 years ago).
It sounds like your parents profiles are not open to editing by all members, but you can send a private message to the profile manager asking to be added to the trusted list and/or made a co-manager so that you will be able to contribute to their profiles. If the manager does not respond in a week or so, then you can follow a procedure for Unresponsive Profile Managers. WikiTree will determine if the manager is no longer active and, if so, will release all profiles managed by that person, after which you can "adopt" your parents' profiles, thereby becoming manager.
Please don't give up - your contributions are very much wanted here!