As long as you are on the trusted list, or the profile is open, you can make any changes that you have good sources for. A personal site (like myheritage) is NOT a source. WikiTree profiles are constant works in progress through the collaboration of all wikitree-ers, and your additions are always welcome. If you have more questions about Biography style and policies, post your questions under "style and policy", and you will get tons of help. Or... I'm not busy and could help you with anything you might want to work on.